** We recommend sizing one size up as they shrink slightly after drying

- 5150 High Performance Main Bearing Set

as the original cylinder head screws elongate during operation and the cylinder head can lift off

The RSR is specifically designed for motorsport and is known for its track-focused features

3mm stroke

Genuine BMW Rear Main Seal, BMW B48 3.0 ** We recommend sizing oneThe rear main seal, also known as the rear crankshaft seal, is a crucial component in an engine. Genuine BMW Part Number: 11148664904 Purpose 1. Prevents Oil Leaks: The primary function of the rear main seal is to prevent engine oil from leaking out of the rear end of the crankshaft. It seals the gap between the crankshaft and the engine block or the transmission housing, ensuring that the oil remains within the engine. 2. Maintains Oil Pressure: By