Rebuilding your engine or giving your cylinder head an overhaul? Internal engine components covers parts that are located within the engine block and cylinder head. Examples include: timing chains and tensioners, rocker arms, rod bolts and studs, head bolts, valve springs, connecting rods, and more. These are Genuine BMW engine parts, performance upgrades, or approved aftermarket brands that have a long track record of reliability and quality.
From the factory, the S85’s rod bearing clearances are notoriously tight. Over time, this lack of adequate oil clearance leads to premature wear, accelerated friction, and the looming threat of catastrophic engine failure.
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