Ok, interesting, so these are about LSPI - or Low Speed Pre-Ignition events.

It seems to be afflicting direct injected turbo engines. So shouldn't really be required for USA-spec 4.0 engines without the particulate filter... not that I recommend skipping it, but maybe the issue is overblown, and Porsche did not change specification for the US-models sans filter just to keep things simple/consistent?

 

You nailed it, I think. I do not see any reason I cannot use 5/50 in my Spyder, and I plan to do so since it does not have a turbo or OPFs. I did ask the Service Manager at my dealer and he said it made sense what I said but I would be taking a chance since it does call for C40 oil, and they have it in stock and use it when a car requires it.

 

Pretty cool article on LSPI, btw: https://www.motor.com/magazine-summa...-pre-ignition/

 

Because there was only one guy at the dealership who knew the score and he was talking to me, while the guys in the back topped off the oil.

 

I find it interesting that all of the arm-chair engineers out there feel that they have so much more knowledge and understanding as to what oil should be run in the 4.0l engine then the manufacturer who designed and warrants the engine...

C40 oil that is warranty approved is becoming easier to get, is recommended by Porsche and covers all operating conditions, heck even priced attractively as seen in the latest links, to me it makes no rational sense to deviate from it.

I doubt that you will be saving money, increasing performance or extending engine life by using non- recommended oils... to me it seems more like a "mod", so you can say to others that you do it differently.

 

If someone knows of a C40 oil in 5/50 let me know, but I still do not see a problem running the Mobil 1 5/50 I have left that I used in my 991.2.

 

I picked this up at my local Audi dealer for $10/liter.
Fully compliant with MY22 GT4 owners manual: VW 511.00 , 0W-40
Audi P/N is circled in second pic.
Easy Peasy.

 

^^^ Cool, I wonder who makes that oil for them...

 

I haven't checked this thread in a few weeks, but just pulled up the link for the C40, .....and, it's backordered. So whether from the shipping fiasco or some other reason, not available right now.

 

So now that I can find 5W40 C40 oil...

My 2022 PDK GT4 manual indicates only 0W40 C40 oil, which I can't find anywhere. I can see VAG denying an engine claim if I use 5W40 oil even if I always run the car with a very conservative warm up.

And I still can't find a clean statement on the oil capacity for this car.

 

Interesting, that is a change for 2022 then:


2020 model shown above

 

@Westcoast would be interesting to me to see if this is a MY or a manual vs PDK distinction. My engineering sense says that in a warm climate and non BMW rod bearings clearances scenarios, 0W-xx vs 5W-xx makes no difference, especially if low throttle and RPM conditions are religiously adhered to until the car is warm.

 

I see no distinction in the manual between MT or PDK, the image I posted does show that the 5W-40 has a minimum temperature of -13F or -25C but for many of us that shouldn't present a problem.

Still it would be good to know why they pulled 5W-40 out of play for 2022, I have asked a buddy with a 2021 model to provide a shot of this same page in their owners manual.

 

2021 PDK

 

Now that I think about it, my manual has references to PDK and to Manual in other sections -> given the above is from a 2021, this is something that was changed sometime after the beginning of MY2021 and is independent of transmission. Would like to know the reasoning. My guess is it's fuel econ related or warranty related after a few claims that could be theorized as having been caused by cold lubrication or pressure.

That said, my recent internetting tells me that in the states, 5W40 C40 is unicorn blend, and 0W40 C40 is pure unicorn ultra-distillate. Can't find it anywhere.