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Message: <blockquote data-quote="Schwepps" data-source="post: 436711" data-attributes="member: 3592">lipquan, the vast majority of cars on the road use semi-synthetic oil and live long lives with it. Just be aware that a Group II mineral oil with only the additives being synthetic, can legally be called a semi-synthetic. So there are semi-synths and there are semi-synths - there's no standard of what constitutes one. Also be aware that the risk of getting sludge in a BMW engine is higher with a mineral oil. Just change your oil and filter often, say every 6,000 km, and you'll be fine.Having said that, the warranty and BSRI on your 1 year old car would be void if BMWM found out.</blockquote>