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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2023 G80 6MT, CCBs
2002 330i Dinan, 5MT
2000 Z3 Conforti, 5MT
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