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Message: <blockquote data-quote="ciklee" data-source="post: 638607" data-attributes="member: 22701">Sorry if my choice of words confuses you. I agree that petrol combustion is inefficient and some residue/contaminants are left behind and goes to the engine oil. Overtime, the engine oil will lose its effectiveness both as lubricant as well as cleaner. But such scenarios should be easily simulated during testing, no? And manufacturers should have sufficient data to conclude engine oil degradation, due to "normal" engine operation and contribution from other systems, should be relatively slow (I object your honour, speculative!!) to warrant longer service interval. My opinion is that only when the engine is not running at its optimum temperature and condition that the oil degradation is accelerated, thus the need to change the engine oil more frequent. For the specific case of the F10, the car comes with various electronics and systems that monitor engine conditions at all time. Shouldn't we rely on these extra data/information to gauge whether it is justifiable to change engine oil at shorter intervals? Or should we trust that BMW knows what they're doing and accept the car's recommendation at face value?</blockquote>