Originally Posted By: edyvw
Originally Posted By: UncleDave
Originally Posted By: zveroboy
Originally Posted By: 1JZ_E46
For gas engines, what is the most stringent oil specification nowadays?
Probably MB 229.5/51 ?
MB spec details 2012
ACEA 2012
Enjoy!
229.52 - even harder to find. Very hard to find in Cali.
UD
Actually, 229.52 is not at all more stringent then 229.51. 229.52 has to do with fuel economy. Mobil1 0W30 X1 meets this spec and you can get it on Amazon.
It is made for modern diesel engines, but considering SAPS levels I think M1 5W30 ESP is still much better oil.
As for most stringent, apparently updated BMW LL-01 is most stringent.
Pretty sure its more than economy, I've read that there is a different oxidation spec for .52 in several places including here on bitog.
http://www.ingelbeen.be/en/news/p/detail/brand-new-mb-claim-229-52-for-mobil-1-esp-0w-30
Ive been using the 2 oils that I could actually get that meet spec the M1 0w30 ESP, and the MB oil. (off Amazon) and there was a recent thread that posted an MB link with a bunch of choices, but they are still comparatively hard to find.
Most oil companies only have none to 1 product thats 229.52 compliant.
UD