MAHLE Original BMW 318I 99-91 Rear Main Seal Set

This rear main seal set from Victor Reinz is made with a durable fluoroelastomer material, known for its resistance to heat and oil, which is crucial for sealing the crankshaft where it exits the engine block. A failing rear main seal can lead to significant oil leaks, often appearing on the transmission bell housing, and can eventually lead to low oil pressure if left unaddressed. This set is designed to fit a wide range of BMW models, including popular ones like the 3 Series (E36/E46), 5 Series (E34/E39/E60), and Z3/Z4 vehicles.

Replacing the rear main seal is a common repair when an engine is out of the vehicle or the transmission is being removed for other service. The fluoroelastomer material offers good sealing performance and longevity in the demanding environment of the engine's rear main bearing area. This ensures that oil stays where it belongs, inside the engine, and prevents it from contaminating the clutch or dripping onto the exhaust components.