It is from another forum but is this true?
..."but "properly maintained" on these engines means an engine rebuild at some point to clean the heads, secondary air passages, replacing the valve stem seals. Then of course the coolant transfer pipe, all the gaskets. "

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold