Quote:
Originally Posted by interceptor428
I believe the dealer put 0w-20 in my January 2015 build 428i...I could "feel" the engine some more..wasn't as smooth as 5w-30 but it's a lease so it stays in. Now my 2013 x1 (n20 engine) had 0w-30 (dealer changed oil) in it for about 2 weeks then I took it out and went back to 5w-30...engine is much smoother and I have 104000 US miles so I'm sticking with 5w-30. just my 2cents
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The only difference between 5w30 and 0w30 weight oil, is the viscosity when cold. 0w30 will be thinner during a cold start, thus flowing more freely and lubricating more components quicker. Once the oil reaches operating temperature, they'd both perform equally. Only difference is, the viscosity modifiers wear out quicker in 0w30 vs 5w30.
https://bobistheoilguy.com/motor-oil-101/