Mobil oil co. recommends 0w40 for our cars
07-24-2009, 07:05 PM
#46
Is there a published temperature chart that shows where 0W-40 synthetic loses its effectiveness that we could compare to a 951 operating temperature in different environments?
My understanding is that the 951 does not get hot enough during street driving anywhere in the United States in the summer to exceed the capabilities of modern 0W-40 synthetic. This was a contributing factor to Porsche's new recommendation for this weight oil for cars in the U.S.
My understanding is that the 951 does not get hot enough during street driving anywhere in the United States in the summer to exceed the capabilities of modern 0W-40 synthetic. This was a contributing factor to Porsche's new recommendation for this weight oil for cars in the U.S.
First off, oil is like religion, there is only one right answer (belief) MINE!
A couple of points to consider:
Porsche reccomends 0w-40 in all their water cooled cars even those sold in Abu Dabi etc where it gets a hell of alot hotter than anywhere in the US.
For those of us who track/race their cars the reality is that running our cars at 100+MPH is LESS streesful that stop and go traffic due to the cooling when running at speed.
Do you have any idea how hot a F-1 engine gets?? Several hundred degrees hotter than yours does...Do you know what weight they run?? Something like 0w-5 or 0w-10 they are proprietary...
In all engines the most wear takes place in the first 30 seconds of a cold start when there is no oil circulating. That is why 0W -XX is better. Period.
Based on this and other considerations I run 0w-40 in my race car (It also allows the engine to produce slightly more HP but don't tell the guys I run against
07-24-2009, 07:24 PM
#47
Three Wheelin'
Join Date: Jun 2003
Location: Phoenix, Az
Posts: 1,854
Likes: 0
Received 0 Likes
on
0 Posts
Is there a published temperature chart that shows where 0W-40 synthetic loses its effectiveness that we could compare to a 951 operating temperature in different environments?
My understanding is that the 951 does not get hot enough during street driving anywhere in the United States in the summer to exceed the capabilities of modern 0W-40 synthetic. This was a contributing factor to Porsche's new recommendation for this weight oil for cars in the U.S.
My understanding is that the 951 does not get hot enough during street driving anywhere in the United States in the summer to exceed the capabilities of modern 0W-40 synthetic. This was a contributing factor to Porsche's new recommendation for this weight oil for cars in the U.S.
same page for 87944S and 87951.
87951
95sl320 dd
07-24-2009, 07:31 PM
#48
Three Wheelin'
Join Date: Jun 2003
Location: Phoenix, Az
Posts: 1,854
Likes: 0
Received 0 Likes
on
0 Posts
First off, oil is like religion, there is only one right answer (belief) MINE!
A couple of points to consider:
Porsche reccomends 0w-40 in all their water cooled cars even those sold in Abu Dabi etc where it gets a hell of alot hotter than anywhere in the US.
For those of us who track/race their cars the reality is that running our cars at 100+MPH is LESS streesful that stop and go traffic due to the cooling when running at speed.
Do you have any idea how hot a F-1 engine gets?? Several hundred degrees hotter than yours does...Do you know what weight they run?? Something like 0w-5 or 0w-10 they are proprietary...
In all engines the most wear takes place in the first 30 seconds of a cold start when there is no oil circulating. That is why 0W -XX is better. Period.
Based on this and other considerations I run 0w-40 in my race car (It also allows the engine to produce slightly more HP but don't tell the guys I run against
A couple of points to consider:
Porsche reccomends 0w-40 in all their water cooled cars even those sold in Abu Dabi etc where it gets a hell of alot hotter than anywhere in the US.
For those of us who track/race their cars the reality is that running our cars at 100+MPH is LESS streesful that stop and go traffic due to the cooling when running at speed.
Do you have any idea how hot a F-1 engine gets?? Several hundred degrees hotter than yours does...Do you know what weight they run?? Something like 0w-5 or 0w-10 they are proprietary...
In all engines the most wear takes place in the first 30 seconds of a cold start when there is no oil circulating. That is why 0W -XX is better. Period.
Based on this and other considerations I run 0w-40 in my race car (It also allows the engine to produce slightly more HP but don't tell the guys I run against
"proprietary", i've been in aviation as pilot/mechanic for 38 years and have seen lots of synthetic oil used in turbine engines but none with 0-5, 0-10, etc
87951
95sl320 dd
07-24-2009, 07:41 PM
#49
Porsche is changing their opinion based on new oil technology, feedback from their customers and data collected from their service departments worldwide.
07-24-2009, 08:50 PM
#51
Three Wheelin'
Join Date: Jun 2003
Location: Phoenix, Az
Posts: 1,854
Likes: 0
Received 0 Likes
on
0 Posts
you don't think porsche is really catering to the later models with their recommendations, i do.
i've never been to a porsche dealer and i doubt if they'll provide any warranty coverage for folks who change to synthetic on an older ride and then have problems.
87951
95sl320 dd
07-25-2009, 02:29 AM
#52
Drifting
Hi , here is what we have found in regards to oil pressures and engine life / reliability from working on Porsche cars for the last 30+ years .
Now first of all we ask ourselves a basic questions in regards to the 944 / 951
A) what century of engine design are we talking of ?
Answer = last century
B) when was the 944 all alloy engine and oil circuit designed .(drawing board)?
Answer = early to mid 1970,s
C) was there any 0w-30 or 5w-40 or 5w-50 so called synthetic engine oils available to the public ?
Answer = NO
D) what does the owners manual in say a 1986 year type(example) 951 owners manual printed by Porsche say on the oil viscosity page in regards to ambient temps in the centre shaded look at me section from minus 10 degree celsius(15 deg fa) to unlimited high ambient temp (40 deg and above)(104Fa+)
Answer = 20w-50 .
Now what have we found with customers 951,s in summer commuting etc on say a 5w-40 engine oil , stuck in traffic and the oil temp goes up a bit , the oil warning pressure light comes on at idle , not a good look , and to add insult to injury at the very same time the engine will not produce sufficient oil pressure at high rpm to help protect the very critical No 2 big end bearing , in fact will struggle to get above 4.5 bar oil pressure
Now why is this important ?
Answer = No 2 Big end bearing (mainly) is at risk when the oil pressure is not as high as possible in keeping with the clue given in the owners manual and if we do any form of club motor sport then a 20w-50 is a minimum requirement in this regard .
We only use Valvoline 25w-60 racing only on our own 951 and customer 951's , 944's, 944S2's etc , and so long as the big end shells are replaced before the motor sport life of the said 944 engines we have had no losses at all with multiple Porsche club Championship and class wins .
However we have seen far too many other 944 types blow big ends and all have been on too lower oil viscosity's .We have been checking all new customer 944's , 944S2's, 951's , 968's big ends that we are preparing for track(for the first time) and we are astounded by the number of the above versions mentioned that when we remove the shells all the ones that are worn badly (street use 15-20 years ) have all been on low viscosity oils since the beginning of this century
Note 1)
944 series from 1987 , the oil pressure relief valve opens around 7 bar pressure (approx 102.9 lbs)
that means that if one only gets around 4 bar when at high rpm or less then do not think for a minute that the oil pressures that you are seeing(main oil gallery) are anywhere like that at the big ends, let alone no 2 .
Note 2)
it is by now fairly common knowledge that the (petrol / gasoline) engine oils for engines for this century are very much emission orientated because they have to fit within the ACEA protocols , and naturally these oils are mostly so called synthetics and to help with the ever important fuel economy requirements they are all low viscosity (0w-30 , 0w-40 ,5w-40 etc) and that's fine because these engines were designed from the ground up to use these viscosity's , and here is the very important thing in regards to most of these oils when trying to use them in engines from last century , and that thing is they are very low in ZDDP and higher in the newer" AW" (read Boron) anti wear packages ,
Now in Porsche's from last century this is causing havoc with the flat tappet design cams and lifter faces and thrust bearings just to name two of the problems .
So this is what I call the double whammy , using oils that are lower in viscosity than stipulated by Porsche in their owners manual in the shaded look at me shaded section(risking the big ends), and adding to that oils that naturally could well be too low in ZDDP (risking the cam life etc).
Do not just take my word for it , go to ,on this site the following }
Anything New On The Mobil 1 Front .
https://rennlist.com/forums/993-foru...l-1-front.html
don't just read the first few pages read it all.
Also on the subject of ZDDP here is a link to the same thing being discussed by Mobil on their own web page in relation to Mobil1 Racing .
https://www.mobiloil.com/USA-English..._Oil_FAQs.aspx
In 1996 they halved the content of ZDDP in their formula to meet the new ACEA protocols, this caused havoc amongst the vehicles with flat tappet design. We are still seeing the effects on cars today in the way of prematurely worn thrust bearings, worn cams, cam sprockets, and lifters, worn cylinders and bearings. the Mobil site also goes on to saying it uses double the amount of ZDDP.
And another link to a scientific paper on this amazing subject ZDDP
http://www.apmaths.uwo.ca/~mmuser/Papers/TL05.pdf
this is very important, going on to say that oil companies have tried to replace ZDDP in oils with newer AW additives which have not given anywhere near the results of ZDDP
Regards
BB.
Now first of all we ask ourselves a basic questions in regards to the 944 / 951
A) what century of engine design are we talking of ?
Answer = last century
B) when was the 944 all alloy engine and oil circuit designed .(drawing board)?
Answer = early to mid 1970,s
C) was there any 0w-30 or 5w-40 or 5w-50 so called synthetic engine oils available to the public ?
Answer = NO
D) what does the owners manual in say a 1986 year type(example) 951 owners manual printed by Porsche say on the oil viscosity page in regards to ambient temps in the centre shaded look at me section from minus 10 degree celsius(15 deg fa) to unlimited high ambient temp (40 deg and above)(104Fa+)
Answer = 20w-50 .
Now what have we found with customers 951,s in summer commuting etc on say a 5w-40 engine oil , stuck in traffic and the oil temp goes up a bit , the oil warning pressure light comes on at idle , not a good look , and to add insult to injury at the very same time the engine will not produce sufficient oil pressure at high rpm to help protect the very critical No 2 big end bearing , in fact will struggle to get above 4.5 bar oil pressure
Now why is this important ?
Answer = No 2 Big end bearing (mainly) is at risk when the oil pressure is not as high as possible in keeping with the clue given in the owners manual and if we do any form of club motor sport then a 20w-50 is a minimum requirement in this regard .
We only use Valvoline 25w-60 racing only on our own 951 and customer 951's , 944's, 944S2's etc , and so long as the big end shells are replaced before the motor sport life of the said 944 engines we have had no losses at all with multiple Porsche club Championship and class wins .
However we have seen far too many other 944 types blow big ends and all have been on too lower oil viscosity's .We have been checking all new customer 944's , 944S2's, 951's , 968's big ends that we are preparing for track(for the first time) and we are astounded by the number of the above versions mentioned that when we remove the shells all the ones that are worn badly (street use 15-20 years ) have all been on low viscosity oils since the beginning of this century
Note 1)
944 series from 1987 , the oil pressure relief valve opens around 7 bar pressure (approx 102.9 lbs)
that means that if one only gets around 4 bar when at high rpm or less then do not think for a minute that the oil pressures that you are seeing(main oil gallery) are anywhere like that at the big ends, let alone no 2 .
Note 2)
it is by now fairly common knowledge that the (petrol / gasoline) engine oils for engines for this century are very much emission orientated because they have to fit within the ACEA protocols , and naturally these oils are mostly so called synthetics and to help with the ever important fuel economy requirements they are all low viscosity (0w-30 , 0w-40 ,5w-40 etc) and that's fine because these engines were designed from the ground up to use these viscosity's , and here is the very important thing in regards to most of these oils when trying to use them in engines from last century , and that thing is they are very low in ZDDP and higher in the newer" AW" (read Boron) anti wear packages ,
Now in Porsche's from last century this is causing havoc with the flat tappet design cams and lifter faces and thrust bearings just to name two of the problems .
So this is what I call the double whammy , using oils that are lower in viscosity than stipulated by Porsche in their owners manual in the shaded look at me shaded section(risking the big ends), and adding to that oils that naturally could well be too low in ZDDP (risking the cam life etc).
Do not just take my word for it , go to ,on this site the following }
Anything New On The Mobil 1 Front .
https://rennlist.com/forums/993-foru...l-1-front.html
don't just read the first few pages read it all.
Also on the subject of ZDDP here is a link to the same thing being discussed by Mobil on their own web page in relation to Mobil1 Racing .
https://www.mobiloil.com/USA-English..._Oil_FAQs.aspx
In 1996 they halved the content of ZDDP in their formula to meet the new ACEA protocols, this caused havoc amongst the vehicles with flat tappet design. We are still seeing the effects on cars today in the way of prematurely worn thrust bearings, worn cams, cam sprockets, and lifters, worn cylinders and bearings. the Mobil site also goes on to saying it uses double the amount of ZDDP.
And another link to a scientific paper on this amazing subject ZDDP
http://www.apmaths.uwo.ca/~mmuser/Papers/TL05.pdf
this is very important, going on to say that oil companies have tried to replace ZDDP in oils with newer AW additives which have not given anywhere near the results of ZDDP
Regards
BB.
07-25-2009, 02:56 AM
#53
Three Wheelin'
Amen JET. This can be debated until the cow's come home and as somene else mentioned, it's kinda like talking religion.
When I bought my 951 last year I immediately changed to Brad Penn 20w-50 (PO used Mobil 1 Synth). I live in central TX and it's hot as hell down here in the summertime (as in about 30 days at 100+ so far). I get great pressure all the time (my sender is f'd up now...but that's on the 'to-do' list...) and with that quality of oil in the tank w/ the right amount of ZDDP it's one less thing that you have to worry about.
When I bought my 951 last year I immediately changed to Brad Penn 20w-50 (PO used Mobil 1 Synth). I live in central TX and it's hot as hell down here in the summertime (as in about 30 days at 100+ so far). I get great pressure all the time (my sender is f'd up now...but that's on the 'to-do' list...) and with that quality of oil in the tank w/ the right amount of ZDDP it's one less thing that you have to worry about.
07-25-2009, 03:02 AM
#54
Rennlist Member
Since you have already read the thread, will a stock Porsche 951, with reasonable amounts of engine ware, running in 105 degree weather under aggressive street driving conditions exceed the capabilities of modern 0W-40 synthetic oil?
My assumption is "no" or Porsche would not be recommending this oil for the 951 in the United States.
My assumption is "no" or Porsche would not be recommending this oil for the 951 in the United States.
Heed the words from JET951. This is a Porsche trained mechanic who specialises in front engined models as well as many decades working on rear engined ones.
07-25-2009, 09:53 AM
#55
I tried to find the most recent porsche list online but was unavailable.
Here is one from a couple of years ago..
http://www.wrightune.co.uk/downloads/approved_oils.pdf
A couple of comments:
1. This list is for all Porsches from 1984 on..
2. Even though our owner manuals spec'd dino oil Porsche now only reccomends synthetic
3. If you look at the list all the weights are either 0W- or 5W-40
4. This list is worldwide
The newest list is essentially the same except some oils have been changed because they either are or are not currently available
enjoy
Here is one from a couple of years ago..
http://www.wrightune.co.uk/downloads/approved_oils.pdf
A couple of comments:
1. This list is for all Porsches from 1984 on..
2. Even though our owner manuals spec'd dino oil Porsche now only reccomends synthetic
3. If you look at the list all the weights are either 0W- or 5W-40
4. This list is worldwide
The newest list is essentially the same except some oils have been changed because they either are or are not currently available
enjoy
07-25-2009, 10:03 AM
#56
Also, recently Mobil 1 has come out with a series of "racing oils" which have higher levels of zddp etc.
As you can see the weights of these racing oils are both 0W-xx
https://www.mobiloil.com/USA-English...cing_Oils.aspx
I may try these..
As you can see the weights of these racing oils are both 0W-xx
https://www.mobiloil.com/USA-English...cing_Oils.aspx
I may try these..
07-25-2009, 11:08 AM
#57
There is no chance that I would use M1 0w/40 in those weather conditions. NO Chance at all. May as well pour water in there in my opinion. Unfortunately the Porsche list you're referring to will be a US list, not from the factory, and it bears no relationship to our cars no matter who says so. Seriously, unless you plan to never exceed 3000rpm and live in a very cold environment, you are using the wrong oil.
Heed the words from JET951. This is a Porsche trained mechanic who specialises in front engined models as well as many decades working on rear engined ones.
Heed the words from JET951. This is a Porsche trained mechanic who specialises in front engined models as well as many decades working on rear engined ones.
What I am curious about is that so many smart and experienced people can draw conclusions that are 180 degrees apart from the same information. My mechanic is also an experienced Porsche mechanic and at any given time has 5 or 6 personally owned 944s in his garage not to mention a steady flow of 944 customers. He is a believer in thin synthetics.
I have nothing new to add on this topic but I am enjoying the discussion.
07-25-2009, 08:10 PM
#58
Three Wheelin'
Join Date: Jun 2003
Location: Phoenix, Az
Posts: 1,854
Likes: 0
Received 0 Likes
on
0 Posts
"heat waves approaching 100deg", how do you survive in all that heat.
ez, because we live in the real world.
your mechanic is a believer in repeat customer $$$$.
87951
95sl320 dd
ez, because we live in the real world.
your mechanic is a believer in repeat customer $$$$.
87951
95sl320 dd
07-25-2009, 09:14 PM
#59
Monkeys Removed by Request
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Hi , here is what we have found in regards to oil pressures and engine life / reliability from working on Porsche cars for the last 30+ years .
Now first of all we ask ourselves a basic questions in regards to the 944 / 951
A) what century of engine design are we talking of ?
Answer = last century
B) when was the 944 all alloy engine and oil circuit designed .(drawing board)?
Answer = early to mid 1970,s
C) was there any 0w-30 or 5w-40 or 5w-50 so called synthetic engine oils available to the public ?
Answer = NO
D) what does the owners manual in say a 1986 year type(example) 951 owners manual printed by Porsche say on the oil viscosity page in regards to ambient temps in the centre shaded look at me section from minus 10 degree celsius(15 deg fa) to unlimited high ambient temp (40 deg and above)(104Fa+)
Answer = 20w-50 .
Now what have we found with customers 951,s in summer commuting etc on say a 5w-40 engine oil , stuck in traffic and the oil temp goes up a bit , the oil warning pressure light comes on at idle , not a good look , and to add insult to injury at the very same time the engine will not produce sufficient oil pressure at high rpm to help protect the very critical No 2 big end bearing , in fact will struggle to get above 4.5 bar oil pressure
Now why is this important ?
Answer = No 2 Big end bearing (mainly) is at risk when the oil pressure is not as high as possible in keeping with the clue given in the owners manual and if we do any form of club motor sport then a 20w-50 is a minimum requirement in this regard .
We only use Valvoline 25w-60 racing only on our own 951 and customer 951's , 944's, 944S2's etc , and so long as the big end shells are replaced before the motor sport life of the said 944 engines we have had no losses at all with multiple Porsche club Championship and class wins .
However we have seen far too many other 944 types blow big ends and all have been on too lower oil viscosity's .We have been checking all new customer 944's , 944S2's, 951's , 968's big ends that we are preparing for track(for the first time) and we are astounded by the number of the above versions mentioned that when we remove the shells all the ones that are worn badly (street use 15-20 years ) have all been on low viscosity oils since the beginning of this century
Note 1)
944 series from 1987 , the oil pressure relief valve opens around 7 bar pressure (approx 102.9 lbs)
that means that if one only gets around 4 bar when at high rpm or less then do not think for a minute that the oil pressures that you are seeing(main oil gallery) are anywhere like that at the big ends, let alone no 2 .
Note 2)
it is by now fairly common knowledge that the (petrol / gasoline) engine oils for engines for this century are very much emission orientated because they have to fit within the ACEA protocols , and naturally these oils are mostly so called synthetics and to help with the ever important fuel economy requirements they are all low viscosity (0w-30 , 0w-40 ,5w-40 etc) and that's fine because these engines were designed from the ground up to use these viscosity's , and here is the very important thing in regards to most of these oils when trying to use them in engines from last century , and that thing is they are very low in ZDDP and higher in the newer" AW" (read Boron) anti wear packages ,
Now in Porsche's from last century this is causing havoc with the flat tappet design cams and lifter faces and thrust bearings just to name two of the problems .
So this is what I call the double whammy , using oils that are lower in viscosity than stipulated by Porsche in their owners manual in the shaded look at me shaded section(risking the big ends), and adding to that oils that naturally could well be too low in ZDDP (risking the cam life etc).
Do not just take my word for it , go to ,on this site the following }
Anything New On The Mobil 1 Front .
https://rennlist.com/forums/993-foru...l-1-front.html
don't just read the first few pages read it all.
Also on the subject of ZDDP here is a link to the same thing being discussed by Mobil on their own web page in relation to Mobil1 Racing .
https://www.mobiloil.com/USA-English..._Oil_FAQs.aspx
In 1996 they halved the content of ZDDP in their formula to meet the new ACEA protocols, this caused havoc amongst the vehicles with flat tappet design. We are still seeing the effects on cars today in the way of prematurely worn thrust bearings, worn cams, cam sprockets, and lifters, worn cylinders and bearings. the Mobil site also goes on to saying it uses double the amount of ZDDP.
And another link to a scientific paper on this amazing subject ZDDP
http://www.apmaths.uwo.ca/~mmuser/Papers/TL05.pdf
this is very important, going on to say that oil companies have tried to replace ZDDP in oils with newer AW additives which have not given anywhere near the results of ZDDP
Regards
BB.
Now first of all we ask ourselves a basic questions in regards to the 944 / 951
A) what century of engine design are we talking of ?
Answer = last century
B) when was the 944 all alloy engine and oil circuit designed .(drawing board)?
Answer = early to mid 1970,s
C) was there any 0w-30 or 5w-40 or 5w-50 so called synthetic engine oils available to the public ?
Answer = NO
D) what does the owners manual in say a 1986 year type(example) 951 owners manual printed by Porsche say on the oil viscosity page in regards to ambient temps in the centre shaded look at me section from minus 10 degree celsius(15 deg fa) to unlimited high ambient temp (40 deg and above)(104Fa+)
Answer = 20w-50 .
Now what have we found with customers 951,s in summer commuting etc on say a 5w-40 engine oil , stuck in traffic and the oil temp goes up a bit , the oil warning pressure light comes on at idle , not a good look , and to add insult to injury at the very same time the engine will not produce sufficient oil pressure at high rpm to help protect the very critical No 2 big end bearing , in fact will struggle to get above 4.5 bar oil pressure
Now why is this important ?
Answer = No 2 Big end bearing (mainly) is at risk when the oil pressure is not as high as possible in keeping with the clue given in the owners manual and if we do any form of club motor sport then a 20w-50 is a minimum requirement in this regard .
We only use Valvoline 25w-60 racing only on our own 951 and customer 951's , 944's, 944S2's etc , and so long as the big end shells are replaced before the motor sport life of the said 944 engines we have had no losses at all with multiple Porsche club Championship and class wins .
However we have seen far too many other 944 types blow big ends and all have been on too lower oil viscosity's .We have been checking all new customer 944's , 944S2's, 951's , 968's big ends that we are preparing for track(for the first time) and we are astounded by the number of the above versions mentioned that when we remove the shells all the ones that are worn badly (street use 15-20 years ) have all been on low viscosity oils since the beginning of this century
Note 1)
944 series from 1987 , the oil pressure relief valve opens around 7 bar pressure (approx 102.9 lbs)
that means that if one only gets around 4 bar when at high rpm or less then do not think for a minute that the oil pressures that you are seeing(main oil gallery) are anywhere like that at the big ends, let alone no 2 .
Note 2)
it is by now fairly common knowledge that the (petrol / gasoline) engine oils for engines for this century are very much emission orientated because they have to fit within the ACEA protocols , and naturally these oils are mostly so called synthetics and to help with the ever important fuel economy requirements they are all low viscosity (0w-30 , 0w-40 ,5w-40 etc) and that's fine because these engines were designed from the ground up to use these viscosity's , and here is the very important thing in regards to most of these oils when trying to use them in engines from last century , and that thing is they are very low in ZDDP and higher in the newer" AW" (read Boron) anti wear packages ,
Now in Porsche's from last century this is causing havoc with the flat tappet design cams and lifter faces and thrust bearings just to name two of the problems .
So this is what I call the double whammy , using oils that are lower in viscosity than stipulated by Porsche in their owners manual in the shaded look at me shaded section(risking the big ends), and adding to that oils that naturally could well be too low in ZDDP (risking the cam life etc).
Do not just take my word for it , go to ,on this site the following }
Anything New On The Mobil 1 Front .
https://rennlist.com/forums/993-foru...l-1-front.html
don't just read the first few pages read it all.
Also on the subject of ZDDP here is a link to the same thing being discussed by Mobil on their own web page in relation to Mobil1 Racing .
https://www.mobiloil.com/USA-English..._Oil_FAQs.aspx
In 1996 they halved the content of ZDDP in their formula to meet the new ACEA protocols, this caused havoc amongst the vehicles with flat tappet design. We are still seeing the effects on cars today in the way of prematurely worn thrust bearings, worn cams, cam sprockets, and lifters, worn cylinders and bearings. the Mobil site also goes on to saying it uses double the amount of ZDDP.
And another link to a scientific paper on this amazing subject ZDDP
http://www.apmaths.uwo.ca/~mmuser/Papers/TL05.pdf
this is very important, going on to say that oil companies have tried to replace ZDDP in oils with newer AW additives which have not given anywhere near the results of ZDDP
Regards
BB.
I will run two viscosity oils in this car considering my winters now are much more severe. However you can bet your *** come april of every year. Its brad penn 20-50.
07-25-2009, 09:32 PM
#60
Race Director
Interesting post JET951, while I myself prefer the high oil pressure (5+ bar) like all of my previous 944s had, the factory spec is 4 bar at 5,000rpm with the OPRV already opened. I don't think the factory would give that spec if it wasn't any good... Do you suggest looking for a "problem" if oil pressure is there?>