I can't see any mechanical problem if you change motor oil as regularly as you like. As for BMW, there was a big upset in Australia a few years ago. A batch of faulty oil was released from a refinery but all was well as long as it was changed at normal intervals. A number of BMW's, however, were caught out by their practice of extended service intervals. A rack of almost new BMW six and eight cylinder engines were sent back to the Fatherland for detailed inspection when the engines were totally ruined after the engine oil turned into sludge. Meanwhile, Lexus wasted no time in sending out a letter suggesting (gloating?) that their engineering recommendations for oil changes were a better idea.