Roundel had a did a unscientific study on beemers with over 200k or 300k I don't remember. The two things that stood out were oil changes approx every 3000mi and synthetic oil. yes it costs more to do this but it pays off in the end. Synthetics do last longer but the rate of accumulation of contaminants in the oil from the engine stays the same. so there is still benefit from frequent oil changes--for what its worth
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