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Every series I believe has its gremlins. E46 has the rear subframe, E9x has ICV and connecting rod bearings (still unclear how widespread this is). Not as familiar with the E36 and not familiar at all with the E30. E6x M5 and M6 are pretty bad on reliability.
Just don't confuse "reliable" with "inexpensive to run" because it won't be. Even factoring in the lower reliability of a 335i, the running costs alone of an M car will probably make it more expensive to own, and when repairs do come along on an M, you better believe they'll be more than a 335i.
Check out the "M3 dilemma" thread that was just started in the General M3 Forum. Sorry, can't link from my phone.
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