Supertech High Performance Engine Valves, Springs, Valve Accessories, Pistons and Block Guards Polyacryl Intake Valve Stem Seal 5mm for BMW 5mm Valve Stem Seal Set for Intake Valves / Polyacrylate for BMW B48 / B58 / N53 / N54 / N55 Supertech VSI-BM50-I Polyacryl intake valve stem seals for 5mm intake valves. Application: Intake valves with 5mm valve stem Fits: BMW B48 / B58 / N53 / N54 / N55 engines Quantity: 1 pieces The polyacrylate valve stem seals for the intake side are specifically designed for BMW B48, B58, N53, N54, and N55 turbo engines, providing reliable oil control even under high RPM and boost conditions. Manufactured from high-temperature- and oil-resistant performance materials, they effectively prevent oil from entering the combustion chamber, reduce wear, and contribute to extended valvetrain service life. Ideal for high-performance street vehicles as well as motorsport applications. Designed for 5 mm valve stems .