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In Reply to: M5 ~4000 lbs, M3 ~3400 lbs, engines roughly equal posted by StoneWalk on June 15, 2001 at 14:58:39:
Surprisingly, the M5 motor is not much heavier than the M3 motor, depending on how you try to measure (with accessories, with fluids, etc). The S54 in the M3 has an iron block for strength, which is where some of the weight comes from despite it being smaller in displacement and cylinder count.