Thread: S55 vs. S65
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      06-30-2014, 12:03 PM   #698
G80indy
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Drives: Z3, E46, G80
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Actually the S55 has roller bearings throughout the valvetrain/valvetronic mechanism which should be low friction, and it uses hydraulic lifters for valve clearance - auto adjustment. Keep your oil clean. That part is fairly low maintenance; much needed since the rest of the engine will require a close eye. Highly pressurized turbo motors that also run hot are inherently more "trouble" as the miles rack up. Go in with yours eyes open.
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