Luis de Prat

Thanks. Perhaps for the track. However, engine oil pressure is supposed to drop when reaching operating temperature anyway.

Higher than normal oil pressure isn't necessarily a good thing for a street application, like the OP's.

Luis de Prat

Listing is for Porsche worldwide, depending in local availability. Note the absence of any 10W-60 viscosity for street applications.

Porsche Approved Oils Listing

JET951

i an still amazed when people say that. how do you figure that higher then normal then oil pressure is bad for street application, remember the iol pressure relief valve opens at 8 bar. what do you believe is normal oil pressure for the street? and the track is not the only place you will see extremely high oil tempreture.

the maximum temp i have got my 951 to on the track is about 125 degrees celsius. our customers see about the same, although nik priston s2 can see as high as 135 degrees celsius. we have also had customers sit in stinking hot sydney city traffic. when i mean this i mean bumper to bumper moving 5 meters over 20 minutes. and we have seen oil tempretures up in the 120 degrees celsius. so the track is not the only condition you see exessivly high oil pressure.

i work for 9 years with my father as a porsche specialist, dad has had his business as specialising in porsche for 18 years. before that he worked for a porsche dealership for 15 years. this man knows what he is doing.
throughout this entire time we have used nothing but a mineral oil on all of our customers cars, the same oil that was use by the porsche dealership he use to work at. it use to be called valvoline Turbo V, then Valvoline GP50. a 20w 50 mineral oil that was approved by porsche at the dealership. naturally when dad opened his shop he carried on using this oil, and to this day we have had not one single failure of any type on either street or racing cars. no thrust bearing failures on any 928 which we particularly specialise in. can you fathom that.... Not One Failure. hard to believe isnt it. not to us
all around us we see failures, we have 4 indipendant porsche specialist in our area and 1 dealership. all 4 indipendant specialist switched over to mobil 1 when the Porsche dealership did back in '95-'96. from then on we heard of failure upon failure, from thrust bearing wear in 928's to cam and sproket wear in 944s2, even the lifters were eating themselves away against the cam lobes, grinding...absolutly un repairable scores on bores of engines, it goes on. it just didnt stop. We actually thought at first(back in 2000) that it could have been the quality of components porsche was using, and it was only a matter of time before we were going to see these problems. but still to this day we have seen nothing.

Are you truely going to believe a series of oil tests on a Single car done is series over a huge amount of indipendant Porsche specialists who have seen the worst and know how to fix this simple problem? How was Dougs car driven when the tests were done. was it Stinking hot bumper to bumper driving, everyday. that simulates extreme driving condition. which these oils are meant to protect against? i can tell you those conditions were not extreme conditions. in the end Luis it is up to you what engine oil you wish to use, its your car that will have problems in the long run not ours.

JET951

Luis, you do realise that the oil you are using is mineral oil? just because they hydrocrack it does not mean in anyway that it is synthetic. Synthetic to me, means its entirely made in a test tube, so called sythetic oils are a mineral base with additives. you can actually buy pure sythetic oils but they cost a few hundred per litre and are not suitible for engines. mostly minning truck wheel bearings.

Luis de Prat

Hi, I don't question your experience or expertise, but I'm only going by Porsche's list of approved oils. The tests simply confirmed Porsche's 10K km oil change intervals.

Again, there is no 10W-60 viscosity in Porsche's list of approved oils for cars built since 1984. Regards.

ehall

Mobil 1 Racing oils contain high amounts of ZddP. The other M1 products do not, as Mobil states clearly, on their own website.
ZddP will significantly reduce the life of your catalytic converter. Standard oils, which are low in ZddP, will not.
If you are running without a cat, use a product with high levels of ZddP. If you are running a cat, you have some cost analysis to do.

JET951

that is half true Ehall,
if your car contains a cheap nasty Cat then and only then will the Cat be effected by the composition of the oil(thats if you are burning oil). if you have a high quality cat like the standard 944 turbo cat then there will be no adverse effect on the cat. the oil we have been is high in ZDDP(which is only half the story), and yet the standard cat on our 944 turbo after 23 years still works perfectly well.

why is it that Mobil has only just released the mobil racing oil with high amounts of zddp? re introducing the real antiwear additives?

CPR

Sean,

What is the complete name of the oil your are referring to? Is it "readily" available (as in the US)?
A product switch is in order for me

Also, do you have a particular brand/type of oil filter you would recommend?

Any insight is appreciated, Thanks

ehall

Most U.S. cats are clogged like an old man on too many bran muffins, after 23 years. I don't know about Aussy specs.

ehall

btw. That is the reason most street oils have so little ZddP. It wears out even the best cats. It clogs then up prematurely.

JET951

Hi ehall , just read these threads , to add to what Sean just mentioned ,one of the Porsche's that I own and drive the most (928s 1986 5.0 L quadcam auto )I have known this car since new(3 owners) has now just under 300,000 kms and has only ever run on the oils Sean has mentioned and its original twin cat converters are still working fine .This is the same we see with our customer cars be it in relation to 944, 951, 928, 968, 964, 993 ,964 turbo .etc etc .
So that's what we have found only through in the field experience working on Porsche cars for a living and more importantly a passionate hobby using high grade oils that have had good levels of ZDDP.

Now onto what I regard as the emission oils , do not forget that oil companies( ALL )are in the same boat in relation to complying with the strict emission regulations , so for all oil companies to comply to the ACEA criteria(just one example) for the new car market (particularly petrol engines , read gas USA speak), they have no choice ,so from the late 1990's the amount of ZDDP was reduced and in some cases to extremely low levels, in its place was what they call "Newer AW Packages" and of course mixed in with the emission requirements newer cars have to run on much thinner viscosity oils to help achieve slightly better fuel economy(every little bit helps)in this regard .

For more info and a great read go to ( Rennlist ) 993 Forum , search for the thread }
Anything New On The Mobil One Front
Post number 70 , Steve Weiner(Rennsport Systems) talks about what he has seen in regards to cat converters and levels of ZDDP , then read through the other posts from both Steve and Charles Navarro LN Engineering etc .

Regards .BB.

ehall

I've read both of those. I suspect that the composition of Aussie cat converters are somewhat different than those used on U.S. cars. Most cars 20 years old, or so, in the U.S., have serious cat blockage issues, if they are running the original cat. I have no idea what the different regs may have been in Australia, during that same period of time. I suspect that your cats are either better, or less restrictive. Either way, I don't run a cat anymore and I run AGIP 4t 10w-60. I'm very pleased with it. I may well switch over to Valvoline VR1 Racing oil. The cost is much better.

333pg333

Hmm, I wonder if the US cats weren't different during that time period? There were changes made for the US market due to anti pollution requirements weren't there?
Not sure how much different they need to be for these effects to take place though?

ehall

It got fairly crazy here, in that regard. It wasn't until Europe got serious about air pollution that the World started developing good quality cats.
You can smell a failing U.S. cat. It's a freaking nauseating smell.

INURGRL951

My experiences with Mobil 1 is that it thin in every weight and leaks easily. Most of the time the oil pressure is lower with it also.

Patrick it is best to a MAULE or HAUBERT <--- think the second name is right i would have to update that when down in the shop tommorrow. Because they are full -flow and work better then the fram or other autoparts stores filter those different filter will also cause a lower oil pressure!