




https://f30.bimmerpost.com/forums/showt ... ?t=1467902[...] The N55B30 is just the general name of the series. Wikipedia is incorrect about the application. the 0M0, 0O0 and 0T0 all fall under this. The N55B30M0 was used in both PWG (old) and EWG (newer) applications and are not interchangeable.
The M2 N55B30T0 is not a semi closed deck. Its an open deck design.
The N55B30M0 is absolutely weaker than the N55B30T0. The N55B30T0 has forged crank, dual oil sumps to prevent oil starvation during hard cornering, bigger oil pan, S55 piston heads. You can get the same power with a tune out of all the EWG engines but the 0M0 is weaker and more prone to failures like snapped crankshafts when pushed (seen it multiple times), and the possibility of oil starvation when tracking.
The N55B30O0 in the M235/M135 has all the forged bits of the M2 engine, without the S55 piston heads, larger oil pan, or dual oil sumps.








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