Quote:
Originally Posted by Montaver
The last great M division engine is the S65. Regular models have benefitted from turbo charging though, the B58 in particular is up there with BMW’s best work.
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would agree about the S65/S85. They were derived from a v10 formula 1 project. they didn't share a single thing with the 'lesser' 3 or 5 series models. The n55, s55, b58, and s58 are all cousins in my eyes. its right there in the naming scheme. they used R&D from the n55 and b58 to build the M motors.