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what year are you looking at the early ones use the m54 lump same as the one found on the e39/e46 6 pots the later model had the n52b30 with 261bhp (06-08) with 0-60mph coming up on the auto at 5.8 seconds so pretty nippy

the m54 engine issues are well documentated at this stage and overall id class it as a fairly reliable engine with a few small common problems at higher miles , coolant system overhaul, vanos seals replacement and ccv if you have excessive oil consumption all very much diy jobs. m54 has 231bhp and will do 0-60 in 6.0 seconds in the z4 auto

the n52 i wouldn't have much knowledge on so il let the other lads tune in on that as that engine is spread around a few cars including the 630I one issue im aware of is the hydraulic valve adjuster it will give a rattling noise on cold startups and is common after 50-60k
 
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