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I do think BMWs specs have change for the current evolution of the motor not because the bearings and piston rings have changed but for fuel economy purposes. I think 5W40 used to be the spec but it is now 5W30. Maybe oil cooling is improved? I don’t track so I don’t see temps get “too high” which for me would be 275+.
One subject matter I would like to explore more is LSPI with low viscosity oils. The cause of LSPI is still debated — there are several.
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