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Message: <blockquote data-quote="Vincent Hor" data-source="post: 417769" data-attributes="member: 1221">BMW2007, I have had 5 BMW with the 24 Valve motor (M50 & M52). All had the same sympton that you described. And also many friends M50/M52 that had the same thing too. It's a common sight for me as I exchange lots of views on engines and car maintenance with my mechanic over the many number of years.  So far, all the M50/52 that I have owned never had any compression issues nor requiring a top or full overhaul. Basically these engines are very robust and cheap on maintenance. Just have to be very careful with the coolant and never overheat the engine. Unless you have the know how or experience, the best bet is to bring this car or whatever car that you are buying to a good competent mechanic.</blockquote>