Sought after
The six-cylinder sDrive30i, for reliability
E89 BMW Z4
In two threads on a British owners' forum, three owners name the non-turbo N52 cars, the sDrive30i among them, as the most reliable E89s, and CarGurus says the turbocharged first- and second-generation cars have had timing-chain or cooling trouble. CarGurus, owners' reports (unofficial)