Quote:
Originally Posted by Chriztofor
0w-30 is LL-01 approved and 5w-40 is not, why?
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Could it be that Castrol did not submit 5W-40 to BMW for LL01 approval? Mobil has a similar situation with 5W-30 EPS vs. 5W-40 EPS for BMW LL04; the 5W-30 is approved, the 5W-40 is not. Yet both grades have Mercedes 229.51 approval, which is arguably more stringent than LL04. I've always assumed that Mobil simply did not submit the 5W-40 for LL04, but don't know that for a fact.