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Message: <blockquote data-quote="BMW2007" data-source="post: 417727" data-attributes="member: 4659">Is Oil Sludge common?Yes Bro, i understand and really appreciate your sharing. It is good to warn me as i dont intend (supposed i dont have) the RM20K to spend for the engine overhaul. However my initial thought was the oil sludge is able to flush out, without overhaul the engine. It might be true that the oil sludge is kind of common issue to BMW due to several reasons mentioned above. hmmm.. a superb condition (such as sludge free on high mileage car) of the 728 might be difficult to find. Perhaps Vincent could help to share his experience as he has sorted out many 7 series cars before buying his 728. However, if the oil sludge is un-common to 7 series (M52 especially) especially, then i will walk away from this era of car.</blockquote>