Quote:
Originally Posted by MPR
I thought about switching to a 30 weight just because more viscosity sounded better but decided to stick with a LL17FE oil, specifically LiquiMoly TopTec 6600 0w20. I trust who engineered the engine more than what I read in a forum or my caveman level of oil knowledge.
The clearances on bearing surfaces and oil passages are designed for a specific flow and thus a specific thickness of the oil (at temperature). If your oil is too think it won’t flow good enough and the bearings will be starved.
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Same engines are often getting ll04 in EU though. Mattsheng has also posted a service manual snip or technical brief showing anything from ll17fe up to ll01, so hths of 2.6cst up to ~3.5 and 8cst @ 100c up to >12. Just saying there are clearly a few mechanically permissible options and not contesting ll17fe or your choice.