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Dear sifu, im currently hunting for e39 prefacelift that comes with 35-45k price tag either 523 or 528. but my knowledge about e39 is quite little. so need help from all sifu here. my questions are:1) what are the common problems for e39 (m52) engine?2) which area i need to look carefully before buying the car to avoid buying a lemon car.3) how much i need to spend for wear and tear parts (once i get the car) to make the car back to its pristine condition? is 10k enough or should i spend more?thank you.