Originally Posted By: oil_film_movies
Originally Posted By: edyvw
Also, it could be that Porsche thinks that FSI is not diluting oil as much as TFSI and it could be that there is some trick to VR6 in Porsche.
I would say, Porsche manual is carried over from Europe.
Doesn't seem like its just a manual carryover from Europe thing, since its been this way for 8 years, and still is.
Fuel dilution? I don't know how that might couple into this.
At first I thought it was a CAFE issue with Porsche, getting better fleet fuel economy from a 5w-30 spec, but M1 ESP has a high fuel-hog HTHS=3.58, not much difference at all from M1 0w-40 with HTHS=3.6.
Looking at a VOA of M1 ESP 5w30, it does have 1274 ppm Calcium, quite low, which we know means you probably (not always) get less LSPI with that DI high compression engine when lugging it pulling that massive body. That is my best guess.
This is the classic case of recommending an oil for somebody else's car, so that if a problem develops they won't blame me for using the "wrong" non-spec oil, since I'd likely use Castrol Edge 0w40 if it was mine!!
Man, this is know issue on Euro car. VW 504.00/507.00 (Porsche C30, same spec.) are Low-SAPS oils made for moder diesels (DPF/SCR system) and DI engines. VW at that time had issues with:
1. Fuel dilution (high sulfur negatively affects TBN).
2. CBU.
C30 oils have LOW SAPS and particularly M1 5W30 ESP has very low sulfated ash level at 0.6%. That should prevent to certain extent CBU. However, for C30 oils dilution is HUGE problem in the U.S. I tried M1 5W30 ESP in my previous car, VW CC 2.0T, and at 3K TBN dropped below 2.
In Europe C30 oils were already in effect in 2010 (actually sometimes in 2005 they got rolled out). So it is carry over, since EU gas does not have high sulfur levels, and burn is bit different because EU standards allowed more NoX then the U.S. standards (less CO2 then U.S.), so there is less dilution.
VW 504.00/507.00, C30, BMW LL-01, 04, MB 229.5, 229.51 etc, regardless of grade, are not energy conserving oils.