991.2 Engine Oil for the Track
11-30-2017, 11:13 AM
#16
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If you really want to see how your motor and oil are doing give it a blood test every oil change!
https://www.blackstone-labs.com
https://www.blackstone-labs.com
11-30-2017, 01:37 PM
#17
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I have the callouses from oil threads on the 928 board. I don't need them to be thicker. I just want to know the in-context meaning of 'shear down.'
So you define the phrase 'shear down' to mean 'barely meets viscosity specs.'
Googling this phrase in the context of M1 0W-40 turns up lots of posts that use the phrase to mean 'downward viscosity changes with mileage' and that seems to be a better definition to apply. Certainly, that definition is more-worrisome.
But these Google Hits (need a sniglet for that) are from >10 years ago which is 2 formulations (at least) behind the current "FS" version that's been wending its way through the supply chain for at least 2-ish years.
11-30-2017, 02:45 PM
#18
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Originally Posted by worf928
So you define the phrase 'shear down' to mean 'barely meets viscosity specs.'.
You can see my many Blackstone UOAs by searching with my user name as the tread starter. Also Rennlister "Kevin" has offered up a ton of insight regarding the shearing down issue on the 996/997 Turbo Forums and others, so search his posts out too.
11-30-2017, 10:26 PM
#19
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The owners manual calls for either 0w40, 5w40 or 5w50 Porsche approved oils. Mobil 1 and Motul are good to go. I used Moin my 2009 and 2012 zero,issues. I currently am using Mobil 1 5w50. I live in Florida and don’t have to worry and cold weather either.
12-01-2017, 11:51 AM
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Originally Posted by RDCR
Mobil 1 5W 50 I believe has a higher level of ZDDP which is good for extra metal protection on track.
12-01-2017, 01:33 PM
#23
Burning Brakes
12-01-2017, 01:46 PM
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Yes. 928 folks use it a lot. It has - IIRC - about 10% more ZDDP than the 0W-40.
Yup. 100k mile required warranty on emissions components led to the lowering/removal of ZDDP.
And these days ZDDP is not the be-all-and-all of anti-wear additives.
And these days ZDDP is not the be-all-and-all of anti-wear additives.
12-01-2017, 03:33 PM
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Yes. That Mobil is about 1,100-1,200 PPM. For the really high stuff, you need the Mobil V-Twin. It's about 1,400 PPM. Great for the air/oil cooled 911 Turbos. None of those oils are well suited for a 991.
I do want to try this oil someday, since my car is so freaking fast:
12-01-2017, 04:56 PM
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Not surprising. Expected even. If cats were failing right and left before 100k-miles due to a combination of ZDDP levels in Porsche's recommended oil coupled with the average engine hours spent at WOT to 100k miles, warranty replacement of cats would be a big $$$ deal. Assuming Porsche wants 3-sigma reliability to 100k-miles we'd expect 0.3% failure rates yes?
12-01-2017, 07:32 PM
#27
Burning Brakes
Yes. That Mobil is about 1,100-1,200 PPM. For the really high stuff, you need the Mobil V-Twin. It's about 1,400 PPM. Great for the air/oil cooled 911 Turbos. None of those oils are well suited for a 991.
As a data point, I've never seen a singel catalytic converter failure on Rennlist due to high ZDDP. And there are 993 and 993 Turbo owners with over 100,000 miles with this oil, with healthy cats. I was one of them, and I also never failed Illinois emmissions testing.
I do want to try this oil someday, since my car is so freaking fast:
As a result, most owners don't know, and probably don't much care, how healthy their catalysts are, so long as they get their emissions sticker. And that's in those benighted states that impose such burdens.
07-03-2024, 11:12 AM
#29
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Anyone running Motul 300V in their 991.2? If so 0W40, 5W40, or 5W50?
FCP Euro carries it now (don't have 5W50 listed for some reason), so cost and change interval are no longer a blocker
Even better, would love to see a 300V UOA on our car
FCP Euro carries it now (don't have 5W50 listed for some reason), so cost and change interval are no longer a blocker
Even better, would love to see a 300V UOA on our car
Last edited by AdamSanta85; 07-03-2024 at 11:13 AM.