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Originally Posted by edycol
Actually it is not working that way.
CBU on valves is SAPS (Sulfated Ash and Phosphorus). It is byproduct due to additive and base stock composition and ends up on valves through evaporation loss. Oil with lower Noack (evaporation loss) is better for DI engines. But that doesn't mean engine will use less of that oil. However, primary way to lower CBU is lower SAPS oil. LL04 is low SAPS oil, LL17FE LL01 and LL01 FE are high SAPS oils.
Lubrizol, one of the main additives suppliers, did test on VW EA888 engine and high SAPS oil left 167% more CBU compared to low SAPS.
BMW in Europe uses LL04 oils in all engines since 2009. In the US BMW was sticking to LL01 due to high sulfur in gas until 2017.
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Interesting. Thanks!
For my 2018 M550i, the owner's manual says 0w-20 or 0w-30 in LL-01FE or LL-14+ FE. Yay. I'm under factory warranty for a little bit longer than CPO so I need to stay with factory spec oil (I'd be the one BMW would single out for not using their oil).