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Message: <blockquote data-quote="BMW2007" data-source="post: 20033" data-attributes="member: 4659"><p>Dear Bro, Sifu,Went to used car dealer for car shopping today, was eyeing a beautiful 728i and attracted me to further check on the engine bay. What i found is the oil sludge after removing the oil filler cap, the oil sludge is very obvious on the oil filler cap as well as inside the engine. The car was clock at 180,000 km, is it common for such a high mileage car to built up the oil sludge on the engine? Checked the last service sticker, it was done in 2009 but the previous service was in year 2007. The ex-owner only drove 5000 km in 2 years as the rich guy rarely use the car and owning a few cars as well. I guess this might be the reason of oil sludge built up due to long interval oil change. There are also minor oil leaking on the PS hoses. Checked the BC, it displayed message "check coolant level", seems to be insufficient coolant. Hope it is not a leak.. The speedmeter also noted with 1 or 2 lines of pixel is missing. Checked the function of power window, found the left side at the back is not working. Any idea how much cost to repair the above issues? My key worry is still the oil sludge in the engine, can it be easily flush out or an overhaul is needed?Any idea or comment will be much appreciated!Thanks so much.</p></blockquote><p></p>