Should I make the switch from 0W40 to 15W50
03-22-2007, 03:04 PM
#91
Rennlist Member
Originally Posted by gota911
Also, I need to change the Winter air in my tires to Spring air. Should I go to the Porsche dealer to get that done or can a tire shop do that for me? 
YOU DON'T DESERVE A PCAR
This is the type of trash that really gets to me
03-22-2007, 03:56 PM
#92
Originally Posted by riad
I say start a new thread with that question, it's easily good for 4 or 5 pages... oh yea and mention you want to use N02 instead of air.
03-22-2007, 04:17 PM
#93
Burning Brakes
What 1999 alway forgets and what oil companies have said for a long time "most of your wear is at start up." Thicker oils do not get to the parts as fast as a thinner oil. Most lubrication is based on oil flow and not the thickness of the oil. Secondly he disregards the fact that variocam uses hydraulic flow to work. If anyone is worried about 40W oil is too thin then think that Heavy Duty trucks run 40 weight oil. In the Boating industry were a boat engine has 3 times the load that a car engine has uses 40 weight too. I'm not gonna say use only Mobil 0W40, but I do advise that you should run a thinner winter temp oil such as 0W40,5W40 or 5W50. The enigine was not designed to run 15W or 20W.
03-22-2007, 04:30 PM
#94
Race Car
Originally Posted by jetskied
What 1999 alway forgets and what oil companies have said for a long time "most of your wear is at start up." Thicker oils do not get to the parts as fast as a thinner oil. Most lubrication is based on oil flow and not the thickness of the oil. Secondly he disregards the fact that variocam uses hydraulic flow to work. If anyone is worried about 40W oil is too thin then think that Heavy Duty trucks run 40 weight oil. In the Boating industry were a boat engine has 3 times the load that a car engine has uses 40 weight too. I'm not gonna say use only Mobil 0W40, but I do advise that you should run a thinner winter temp oil such as 0W40,5W40 or 5W50. The enigine was not designed to run 15W or 20W.
03-22-2007, 05:55 PM
#95
Burning Brakes
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Hello,
all SAE40 oils must meet the same SAE J300 specification at 100C
Mobil 1 0w-40 with 14.3cSt @100C sits in the middle of the SAE40 range - 12.5 to 16.3cSt. It is in effect quite a viscous (thick) SAE40 lubricant!!!
At the HTHS viscosity temperature of 150C M1 0w-40 greatly exceeds the required rating of 2.9cP by delivering 3.6cp. This is almost the same as the next rating up - that for HDEO SAE40 oils - which is 3.7cp. This is one reason why this oil is especially required fo the Cayenne V8 turbo!
What confuses people is that some base stocks and the added chemical additives ensure very little "visible" viscosity change from cold (say ambient) to very hot. This is shown by the oils Viscosity Index. An abitrary scale that measures the oil's rate of change from cold to hot - usually from 40C to 100C
It appears that Castrol's "Edge" 0w-40 has very similar performance
My Professional truck drivers also observed this appearance of a "thin" oil when I commenced using Delvac 1 5w-40 instead of Castrol Enduro 2 15w-40 (which I helped develop) in my heavy (Class 8) 500hp trucks running Interstate. One Senior Driver even refused to drive until he was reassured he would not be fired if the engine failed. Four years and One Million kms later he was a commited user - I still have the pistons/rings/liners and bearings that prove almost zero wear at inspection teardown/reassemble. I replaced these items as a precautionary measure and against the advice of Detroit Diesel - I sure wasted $10k!
Regards
all SAE40 oils must meet the same SAE J300 specification at 100C
Mobil 1 0w-40 with 14.3cSt @100C sits in the middle of the SAE40 range - 12.5 to 16.3cSt. It is in effect quite a viscous (thick) SAE40 lubricant!!!
At the HTHS viscosity temperature of 150C M1 0w-40 greatly exceeds the required rating of 2.9cP by delivering 3.6cp. This is almost the same as the next rating up - that for HDEO SAE40 oils - which is 3.7cp. This is one reason why this oil is especially required fo the Cayenne V8 turbo!
What confuses people is that some base stocks and the added chemical additives ensure very little "visible" viscosity change from cold (say ambient) to very hot. This is shown by the oils Viscosity Index. An abitrary scale that measures the oil's rate of change from cold to hot - usually from 40C to 100C
It appears that Castrol's "Edge" 0w-40 has very similar performance
My Professional truck drivers also observed this appearance of a "thin" oil when I commenced using Delvac 1 5w-40 instead of Castrol Enduro 2 15w-40 (which I helped develop) in my heavy (Class 8) 500hp trucks running Interstate. One Senior Driver even refused to drive until he was reassured he would not be fired if the engine failed. Four years and One Million kms later he was a commited user - I still have the pistons/rings/liners and bearings that prove almost zero wear at inspection teardown/reassemble. I replaced these items as a precautionary measure and against the advice of Detroit Diesel - I sure wasted $10k!
Regards
03-22-2007, 05:58 PM
#96
Chandler!
Rennlist Member
Rennlist Member
Originally Posted by Doug Hillary
Hello,
all SAE40 oils must meet the same SAE J300 specification at 100C
Mobil 1 0w-40 with 14.3cSt @100C sits in the middle of the SAE40 range - 12.5 to 16.3cSt. It is in effect quite a viscous (thick) SAE40 lubricant!!!
At the HTHS viscosity temperature of 150C M1 0w-40 greatly exceeds the required rating of 2.9cP by delivering 3.6cp. This is almost the same as the next rating up - that for HDEO SAE40 oils - which is 3.7cp. This is one reason why this oil is especially required fo the Cayenne V8 turbo!
What confuses people is that some base stocks and the added chemical additives ensure very little "visible" viscosity change from cold (say ambient) to very hot. This is shown by the oils Viscosity Index. An abitrary scale that measures the oil's rate of change from cold to hot - usually from 40C to 100C
It appears that Castrol's "Edge" 0w-40 has very similar performance
My Professional truck drivers also observed this appearance of a "thin" oil when I commenced using Delvac 1 5w-40 instead of Castrol Enduro 2 15w-40 (which I helped develop) in my heavy (Class 8) 500hp trucks running Interstate. One Senior Driver even refused to drive until he was reassured he would not be fired if the engine failed. Four years and One Million kms later he was a commited user - I still have the pistons/rings/liners and bearings that prove almost zero wear at inspection teardown/reassemble. I replaced these items as a precautionary measure and against the advice of Detroit Diesel - I sure wasted $10k!
Regards
all SAE40 oils must meet the same SAE J300 specification at 100C
Mobil 1 0w-40 with 14.3cSt @100C sits in the middle of the SAE40 range - 12.5 to 16.3cSt. It is in effect quite a viscous (thick) SAE40 lubricant!!!
At the HTHS viscosity temperature of 150C M1 0w-40 greatly exceeds the required rating of 2.9cP by delivering 3.6cp. This is almost the same as the next rating up - that for HDEO SAE40 oils - which is 3.7cp. This is one reason why this oil is especially required fo the Cayenne V8 turbo!
What confuses people is that some base stocks and the added chemical additives ensure very little "visible" viscosity change from cold (say ambient) to very hot. This is shown by the oils Viscosity Index. An abitrary scale that measures the oil's rate of change from cold to hot - usually from 40C to 100C
It appears that Castrol's "Edge" 0w-40 has very similar performance
My Professional truck drivers also observed this appearance of a "thin" oil when I commenced using Delvac 1 5w-40 instead of Castrol Enduro 2 15w-40 (which I helped develop) in my heavy (Class 8) 500hp trucks running Interstate. One Senior Driver even refused to drive until he was reassured he would not be fired if the engine failed. Four years and One Million kms later he was a commited user - I still have the pistons/rings/liners and bearings that prove almost zero wear at inspection teardown/reassemble. I replaced these items as a precautionary measure and against the advice of Detroit Diesel - I sure wasted $10k!
Regards
03-22-2007, 11:38 PM
#99
Three Wheelin'
Originally Posted by riad
Stop it you're embarrassing yourself.
) 
03-23-2007, 01:24 AM
#100
Ironman 140.6
Rennlist Member
Rennlist Member
Originally Posted by Dave Howerdel
When it comes to oil, Doug knows his ****. He also makes educated choices...(obviously as he owns a 928. )
) jk....
I'm actually a huge 928 fan!! 
03-23-2007, 07:16 PM
#101
Instructor
Just for fun I'll post the notes from my Mobil 1 15w50 oil analysis. I switched to Amsoil 5w40 this time, after running Mobil 1 15w50 for the last 2 changes, this previous sample was taken after 13 months and 3k or so miles.
"No problems showed up in the sample from your Porsche. All wear read at or below averages for this type of engine, which is a very good indication of normal wearing parts and careful operation. The universal averages show normal wear after 4800 miles on the oil. Insolubles were low at 0.2%, showing good oil filtration. No fuel dilution or anti-freeze was found. Silicon was normal indicating good air filtration. The TBN was 7.4, loads of active additive left. Try 4000 miles for your next sample. Leaving it in place more than a year is okay."
I'll post again with my next sample results. Should only take another year or so
Andrew
I switched to Amsoil 5w40 this time, after running Mobil 1 15w50 for the last 2 changes, this previous sample was taken after 13 months and 3k or so miles."No problems showed up in the sample from your Porsche. All wear read at or below averages for this type of engine, which is a very good indication of normal wearing parts and careful operation. The universal averages show normal wear after 4800 miles on the oil. Insolubles were low at 0.2%, showing good oil filtration. No fuel dilution or anti-freeze was found. Silicon was normal indicating good air filtration. The TBN was 7.4, loads of active additive left. Try 4000 miles for your next sample. Leaving it in place more than a year is okay."
I'll post again with my next sample results. Should only take another year or so
Andrew
03-23-2007, 09:24 PM
#102
FYI....here were comments from Blackstone on 0w40 used for 7500 miles with 53000 on the odometer:
"Our experience with Porsche engins is that they tend to wear very well, and yours is no exception. The universal averages column shows typical wear from this type of engine after 3100 miles on the oil. Wear metals in your sample were remarkably low, and you've run your oil more than twice that interval. Metals were in the correct balance to show no mechanical problems inside the engine. You haven't hurt the oil any in 7500 miles use, and we think you could probably run the oil longer, if you wanted. No contaminats found"
I've done 2 more samples since at 7500 mile intervals with similar results.
"Our experience with Porsche engins is that they tend to wear very well, and yours is no exception. The universal averages column shows typical wear from this type of engine after 3100 miles on the oil. Wear metals in your sample were remarkably low, and you've run your oil more than twice that interval. Metals were in the correct balance to show no mechanical problems inside the engine. You haven't hurt the oil any in 7500 miles use, and we think you could probably run the oil longer, if you wanted. No contaminats found"
I've done 2 more samples since at 7500 mile intervals with similar results.
03-23-2007, 11:16 PM
#104
Instructor
Originally Posted by Blackness
OK, I'll bite and ask the stupid question...
Where do you have your oil analyzed?
Where do you have your oil analyzed?
I've used a couple different services, but Blackstone gives you the nice paragraph explaining everything, if you don't like interpreting the raw data yourself.
In terms of oil for these cars, any modern multigrade will do just fine, on another interesting note, the Cayman 9ff CR-42 4.1L na has a placard listing "Castrol RS 10W-60."
Andrew
