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Message: <blockquote data-quote="bmwcar" data-source="post: 172714" data-attributes="member: 2286">E39 and E46 share alot of the same parts, engines and transmissions. the running costs of the 2 models are very similar as they both have the same issues. the e36 has the similar engines but different transmissions though......  before i took over the e46 323ci, i checked with my parents friend who still has an e39 523i (same engine and transmission as my car) which he got in 1997...over the 8 years, he has clocked almost 200,000 km and had no issues at all....but he has done preventive maintaince - eg changed his atf at 80,000 km and then every 40,000 km onwards..... the only thing he had to change was his exhaust system which he did because he kept hearing an annoying knocking sound which even his friend or mechanic could not hear.... but he changed it anyway. based on that, i concluded that the car is reasonable to run provided it has been correctly maintained... of course, like most things in life, you would hear good and bad experiences..... some e46 owners have also done 200,000 km+ with no major issues while others have 1/4 that mileage and already have issues.... same with the e39..... All things being equal, e39 and e46 should have the same running costs, the same issues....it just depends on your luck......and lack of luck can be expensive in this case.......check out the e39 and e46 maintanence threads, alot of expensive similarities......... Quite sure that alot of our experiences are very similar and we could pool our experience together to understand our cars better.....</blockquote>

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