I hope that "lightweight" crankshaft doesn't sacrifice reliability. The S58 motor seems to be one of the most reliable modern M engines with no catastrophic failures like a crankhub or rod bearings but then again we're only over a year into the S58 so time will tell. It was based on the B58 and I know for a fact that B58's are bulletproof as I racked up 54k miles in a span of two years with nothing besides oil changes. Fingers crossed the S58 lives up to the B58 reliability wise. And yes I know the S58 is a monster with people breaking into 700's easily with bolt ons and tunes. Let's see what happens!
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