Jet Jockey

Also note that the MY2019 cars also require the new C40 even if they came with no GPF exhaust.

worf928

It appears to be the same ESP formulation as earlier in this thread and on Mobile’s site as C40.You’ll note that the ‘product information’ on walmart is for the FS formulation.

Can’t know for sure until you have a bottle in your hand.

I thought it was MY ‘20 and it was indeed coincident with GPF in Europe.

Westcoast

The back label on the image at Walmart is inconclusive and I have yet to locate the appropriate Mobile 1 product code for the C40 oil, it is not 123875 that is A40 oil.

From what I have read about C40 there is a significant change in the formulation to to prevent LSPI, changes in the detergent formulation and reduced anti-wear additives like ZDDP, IMHO enough changes that getting the right spec is crucial (at least to me) for my new Spyder.

The hunt continues...

​​​​​@Jet Jockey it would seem from your pictures the product code might be 826529 at least for the 1l size, I am going to check with my Porsche Service department.

worf928

The mobil/en site is a pile of crap (many reasons.)

As I wrote: insufficiently-transparent. If the C40 is so phookin' great then why isn't it backward compatible?
Not that I'm going to put anything other than a C40 oil one of our '21s. Not until I know a lot more. And no C40 oil will go in a pre-C40 engine.

worf928

According to Mobil's site:

https://www.mobil.com/lubricants/-/m...94A7396657AC09

... Porsche C40 oil does not exist.

October 2019 date on that.

Here... this'll make your head explode then:

https://www.suncoastparts.com/produc...D_BwE[/url

Looks like @Jet Jockey is correct: C40 with MY'19. So, we've had two years for Mobil/Porsche/Motul (etc.) to get their $h1+ together on C40 oil.

Jet Jockey

Yes indeed, this what my research found. It was also confirmed by the head technician at my Porsche dealership that certain MY2019 Cayman and Boxsters have to use the new oil. Why? I'm not sure because we don't even have the new exhaust systems (the GPF portion at least) in the North American cars. Perhaps some other part of the exhaust system requires that new oil type too.

The other strange thing that I found during my research was a performance drop (on paper) with cars associated with the new oil formulation. The 0-60 mph times for the MY2019 Caymans IIRC increased by 0.5 of a second according to Porsche data. I'm left wondering if the new oil and new exhausts require a re-tune of the ECU to meet certain criteria and perhaps a drop in acceleration performance.

I must say I'm glad I got a MY2018 GTS and avoiding all this messy oil issue.

modifieda4

the new oil or the new exhaust with filter? i've believe the latter could effect 0-60 times.

Jet Jockey

It seems that starting with the MY2019 Caymans that the performance numbers from Porsche show an increase in the 0-60
times and that’s the year the new oil formulation came into effect yet and as far as I know the exhaust system here in North America was not changed. So if those numbers from Porsche are correct and there is a real performance loss, then it must be because of the switch to the new oil type but why I don’t know.

Westcoast

Sorry, I don't agree with your logic here... but do with part of your statement, "... why I don't know "

348SStb

Reviving this thread- I have a question and also some helpful information. Question is below.

Available C40 approved oils in the USA are as follows:

0w-40
Mobil1ESP X3 0W-40

5w-40
Liqui Moly TOP TEC 4110 SAE 5W-40
Motul 8100 X-CLEAN GEN2 5W-40

Note the literature which states that C40 oil is not backwards compatible with vehicles requiring A40.

=====
=====

In advance of a recent service on my 2017 991.2, I specifically requested Porsche-approved 5w-40 for my vehicle. (I do not want to use 0w-40 in a hot climate and Porsche lists both 0w-40 and 5w-40.)

When the Porsche dealer realized they forgot to order the A40-approved Mobil1 5w-40, they used Mercedes OEM Mobil1 5w-40 which does not carry A40 approval. I was advised that my car would still be warrantied and that Porsche NA approves (behind the scenes) of using Mercedes-spec Mobil1 5w-40.

Splitting hairs? Maybe. But I don’t like to argue with a manufacturer. For now I did not make them remove the Mercedes oil.

Thoughts?

Westcoast

Hmmmmm, seems like nudge, nudge-wink, wink to me, approved products will have documentation to back them up.

Having said this, short term (one oil change) is not likely to be an issue, however... now that they have said it to you and you accepted it, will they continue using the MB approved oil in your car and not bother ordering in the officially approved oil?

348SStb

Absolutely not because I will not allow it!

Antipodean

Strictly, the topic of this thread is whether it is ok to use A40 oil where C40 is specified by Porsche, and where to source C40.

You are asking whether it is ok to use Merc Mobil1 where A40 is specified by Porsche.

Now for people interested in C40 5W-40 oils, here is the latest list from Volkswagen (also includes the 0W-40 oils; note VW 511 00 is equivalent to Porsche C40).

348SStb

Thanks for the clarification, kind authority figure.

Since you didn’t figure this out in your own — I decided rather than start another oil thread, I thought I would make a contribution and also ask a question.

Thanks for not answering my question, by the way. On the other hand, you win the award for best spreadsheet maker.

Bill Mitchell

I find it interesting that only XOM and VW/Audi offer 0W-40 oil while all the other aftermarket suppliers have only 5W-40. I believe 0W-40 is the preferred viscosity but in reality for most of us the 5W-40 will work just fine at the ambient temperatures we will experience. N. Dakota and Siberia excepted, of course. I have suspicions that the VW/Audi oil is actually Mobil 1.