The BMW S65 was an extremely popular engine that powered the M3 from 2007-2013. In that time, it won the International Engine and Powertrain of the Year Award for Best 3-liter to 4-liter Engine ...

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Putting one under the hood of a 135i, though, might just be the best thing you can do with the old S65 engine. My position on the 1M would be dramatically different, however, had it been fitted ...