Still have my 2011 328 and followed the 15,000 mile oil changes since day one. Currently have 184,000 miles on it and the engine runs like a champ. No valve sludge either. All oil changes were performed by my dealer. I was extremely skeptical since I keep my cars for 10 years. Since the X5 is down to 10,000 I will probably follow that as well for the next 10 years.
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2021 M40i Phytonic Blue / Black Vernasca
2020 X5 xDrive 40i Tanzanite Blue / Coffee Vernasca
2011 328xi. Space Grey - Sold 188,925 great miles
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