Fel-Pro BS40729 is a rear main seal for verified Ford Edge, Ford F-150, and Mazda CX-9 applications that need a dependable fix for oil leaking at the rear of the crankshaft. Its application-specific, OEM-style design helps restore the sealing surface during stock engine repair, making it a practical choice for professional service work, stock rebuilds, and DIY leak repairs on street-driven vehicles.

Fel-Pro BS40729 Features:

• 1-piece rear main seal design replaces a worn crankshaft seal to help stop engine oil from escaping at the rear of the engine.
• Molded rubber construction, referenced as nitrile rubber with carbon steel in the product research, is built for an OEM-style fit, finish, and function.
• Application-specific engineering supports proper fit and serviceability in the repair environment, including engines with less-than-perfect sealing surfaces.
• Intended for stock replacement use on street-driven cars and trucks, not for heavy race applications.

A rear main seal commonly gets replaced when age and crankshaft wear allow oil to pass the sealing lip and run down the back of the engine. Inspect the mating surfaces during installation and follow the vehicle service procedure for best results.

Verified fitment includes 2007-2024 Ford Edge, 2011-2025 Ford F-150, and 2007-2015 Mazda CX-9 applications. Other vehicles mentioned in research were not consistently verified, so confirm your exact year, make, model, and engine before ordering.