Just rolled over 200,000 miles this weekend in my 23 year old (e39) M5. Did the cooling system, resealed oil areas, and repaced every bushing/bearing/ball joint in the car at 125,000 miles (when they originally started showing signs of aging), so will ignore them till 250,000. Been pretty problem free. The key to happiness with higher mileage cars is replacing everything when you're in an area, rather than doing it piece by piece as they fail-- you'll always be fighting something that way.
... not that that strategy worked on my e9X, which I sold because I couldn't stand working on it at 110,000 miles. e60 M5 would almost certainly share the same fate, if we put real miles on it.
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2005 M3 Coupe, 2004 M3 Wagon, 2001 M5 Sedan, 2008 M5 6MT Sedan, 2012 128i M sport
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