Had a friend bring their 2013 BMW 550i to me yesterday to see what the engine noise is. I asked her when was the oil changed last and she said when I did it during 2019 at 122k miles. Needless to say she has 159k on it now and she wonders why the valve train is rattling around. Fixing to go drain it now. I expect it to be pretty low too. I'll let y'all know.

A BMW 550i engine is not one you want to abuse in my opinion.

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Jim