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BMW M635CSi (1985 - 1989)

Last updated 18 March 2013

Understated looks, fantastic performance and soundtrack, the definitive fast BMW sports coupe
M Sport engine can be very expensive to rebuild


The standard BMW 635CSi was a very impressive sports coupe, with effortless and quick autobahn cruising on the menu. But it wasn't the ultimate 6-Series. That came six years into its production run. Thanks to some inspired thinking from the Munich product planners, the M635CSi was created by combining the 286bhp M-Power engine from the mid-engined M1 and the 635CSi's body.

With stiffened suspension, improved damping as well as standard limited slip differential, the full-sized coupé became a brilliant package, with masses of all-round ability and a 155mph maximum speed. Values remain significantly higher than non M-Sport coupes - and rightly so, given the specialist nature of the M635CSi. Keep an eye out for fakes, and remember that the M-Sport engine costs significantly more to fix when it goes wrong.

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