Advice for buyers
What should I look for in a used BMW 3 Series coupe?
If a potential buy doesn't have a complete service history, walk away. A fully-stamped service book not only reduces the risk of buying a dud, it also increases its desirability (and therefore price) when you sell it on later.
The suspension is the most likely area to cause concern, so listen out for any tell-tale clonks on a test drive. But also check the tracking, which can also go awry. Sub-standard handling and premature or uneven tyre wear are sure signs of possible trouble.