C40 Oil Discussion
04-08-2022 | 10:05 AM
#511
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@Charles Navarro Thanks for joining the discussion and sharing some key information about not only viscosity and cold starts but also engine wear and environment effects on oil in the engine. 
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05-01-2022 | 12:17 AM
#512
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what are your thoughts of running mobil 1 5w-50. in the 992 gt3?
in the prior gen gt3/rs cars there were quite a few recommendation for track cars to run the m1 5w-50 oil.
thx
in the prior gen gt3/rs cars there were quite a few recommendation for track cars to run the m1 5w-50 oil.
thx
The C40 standard covers two items - LSPI (low speed pre-ignition) and GPF (gasoline particulate filter). In my opinion, the M1 C40 oil is better than the A40, but I'd wager the reason for a mandate of 0w is for fuel economy. Believe it or not, a 5w40 will net lower MPG than a 0w40. There can't be any functional difference in the engine that would require a 0w40 over a 5w40.
If concerned about your warranty, I would recommend cutting oil change intervals in half and once the warranty is up, there will for sure be plenty of choices for a 5w40 C40/VW 511 oil or you could run Driven's DI40, which is their equivalent. That's what I personally run in my direct injected vehicles.
If concerned about your warranty, I would recommend cutting oil change intervals in half and once the warranty is up, there will for sure be plenty of choices for a 5w40 C40/VW 511 oil or you could run Driven's DI40, which is their equivalent. That's what I personally run in my direct injected vehicles.
05-01-2022 | 12:49 PM
#513
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Is a 5w50 viscosity approved for the 992 GT3? If so, I don't see that causing any problem, however M1 5w50 tends to shear out of grade very fast, however it's still going to be much better than M1 0w40, that's for sure! Just change the oil more often. If tracking the car, I'd change the oil before and after every track event. However, I'd prefer to run a better oil like Driven, especially a race oil for the track, but that's what I prefer to do.
05-01-2022 | 04:40 PM
#514
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05-16-2022 | 03:04 PM
#516
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You already have the correct answer from the owners manual, C40 is the specification required, your dealer is wrong to put in A40.
FWIW, C40 is for all 4.0l engines in the 718 and that is world wide.
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05-16-2022 | 03:10 PM
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Last edited by GrantG; 05-16-2022 at 03:49 PM.
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05-16-2022 | 03:23 PM
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If a dealer puts in an A40 oil, be sure they note it on the workorder, so if you have a problem, you can CYA. The reason for needing a C40 oil is the whole LSPI issue with the calcium detergents used in the A40 oil.
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Westcoast (05-16-2022)
05-16-2022 | 03:43 PM
#519
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@gr8ful4flat6 What year is your car?
05-16-2022 | 03:47 PM
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The 2020 owners manual lists 5w40 as warranty approved... unless Porsche has officially rescinded that approval. This opens op a number of other oils, Motul and Liqui Moly to name a couple.
@gr8ful4flat6 What year is your car?
@gr8ful4flat6 What year is your car?
05-16-2022 | 03:48 PM
#521
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The 2020 owners manual lists 5w40 as warranty approved... unless Porsche has officially rescinded that approval. This opens op a number of other oils, Motul and Liqui Moly to name a couple.
@gr8ful4flat6 What year is your car?
@gr8ful4flat6 What year is your car?
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05-16-2022 | 04:16 PM
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05-16-2022 | 04:47 PM
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Correct, Mobil 1 has an exclusive in C40 in the 0W40 weight. I have been able to find the ESP X3 stuff (the one you want) at some Autozone stores (they have messed up the inventory system, so checking electronically is not reliable).
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