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Originally Posted by CJW2OO4
In my ownership all I have done other than overhaul the suspensions is regular oil changes, spark plugs, filters, coolant flush, diff and tranny fluid and will probably be doing the brakes the following spring. (Maybe oem BBK) Have not touched anything else really. Might look into replacing the pump and t-stat. Have you had issues with them?
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They're known to fail as early as 60k, most typically go out around 75-80k.
Quote:
Originally Posted by mhughett
I have 4 friends/family with N52 engined BMW's although none of them Z4's. 2 of the 4 had their pump fail at about 70-85k miles. My wife's X3 just got to 80k last month and I plan to replace the pump and t-stat this winter. It's a royal PITA to get to it on the X3 though so it won't be much fun.
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Normally I would have no problem just changing it when it fails but I'd hate to have to deal with this on the way to the track or during an event. I think I'm just going to replace it at 75k. Parts should be around $450 and I've seen some good E90 DIY's posted.