Quote:
Originally Posted by BMRLVR
Stop making these childish, condescending posts! Obviously BMW M knows how to design an engine, but since they have had a massive rod bearing recall in the past they may have some issues with their clearances on mains and rods!
If these engines spun to 7k they would probably be fine with 0.001" of clearance, but spinning 8.4k the hydrodynamic wedge of oil is not thick enough to prevent metal on metal contact in some instances. This boundary lubrication condition takes its toll on bearings over a period of time!
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Sounds like clean oil is imperative if one wants to lessen the risk of engine failure here. Maybe this is why the viscosity range is so great in the recommended oil.