So your owners manual specifies C40 oil, Charles explained the multiple reasons for C40, seems like there is no question to be asked...

 

The better question is not “if we can”, but rather “is there a better oil” for the 4.0L motors?

This again for GPF delete cars. Perhaps moot for me as I’m an OEM dealer maintained buyer.

 

Regarding your first comment, some people here seem to be bending over backwards to find a non-Porsche-recommended oil, like there is something wrong with the warranty approved choice?

Second comment, the C40 spec oil is not only about the GPF, taking it off doesn't change the other requirements for C40.

 

Lol I’ll stick to C40

 

Well everything I read echos Charles comments above “LSPI or GPF” need C40. LSPI is not applicable to 4.0L na engines. C40 formulation reduces ash...this is an environmental/GPF consideration.

Anyway, only slightly academically interested, I just drop at the dealer per the SM...

 

We are no different than every other automotive enthusiast group, we treat oil as religion. And within virtually all these oil religions they universally dislike Mobil 1, they consider it to be too pedestrian for their precious machines. It’s quite entertaining in many regards.

Personally, I think the best mainstream motor oil on the market is Pennzoil. The natural gas derived base stock is brilliant and the overall thermal stability of their formulations seems to be extraordinary. But they haven’t branched out into the more boutique standards so unless you have an American or Japanese car it doesn’t meet your spec.

Regarding manufacturers spec components, we could have a tag team rumble if we started a thread that talked about C40 oil and N-Spec tires at the same time

And my C40 spec 5W-40 Motul is supposed to show up today and my lift should be here next week, just in time for my post break in oil change

 

In this excerpt from the LN Engineer website I read that this can be an issue with naturally aspirated GDI engines like the 4.0l:

And for the ash content reducing it seems like a prudent move (GPF or not) for environmental considerations.

 

Just as an FYI, my local dealer had mobile 1 C40 in stock. It's not super clear on their website but I had them send me pictures before I purchased it. They show it as in stock, currently, if people are still looking:
https://www.getporscheparts.com/p-mo...-oil-1-l-o0117

 

My italian dealer is still using A40 oil... they don't have C40 and they didn't even know it existed before I asked...

I have 5000km and need to refill, so I jusft bought 1 liter (1 quart) on eBay.

Next year on car service I will provide them C40 oil since they probably will be still using A40...

 

Nothing scientific here, but from my recent experience regarding oil consumption, I have been watching a drop in oil level with LM, topping up a little yesterday.

 

Well that's really discouraging. The difference between A40 and C40 has been apparent to anyone with internet access for at least 6-7 months now and Porsche specs C40 for ALL flat 4 and flat 6 engines since at least 2019. This dealer should not be servicing vehicles.

On the oil subject itself, C40 oil is low SAPS which from all I can determine is every bit as important as the GPF issue, thus the requirement for it even before GPF's appeared. Here in the US M1 still isn't readily available outside dealerships while Motul and LM both are. I'm almost there on doing my first oil change on my GTS and have C40 waiting on the shelf thanks to internet sales but running out for a spare quart of C40 still isn't an option.

 

Pelican parts wants s$27/Liter+$17 for shipping! ygtbsm! $44 for 1 Liter? Would like to have a spare liter in case I need to add some before next scheduled service. Where can I order some that doesn't also require a personal lubricant?

 

 

That link is for Motul. Don't want to mix oils if I don't have to.

 

It's oil..... a different C40 oil will have literally zero effect.

Then you're stuck paying the shipping at Pelican parts or some exorbitant price at the dealership.