BBC Rear Main Seal & STG 2 Buick V6 2&3 Design

The FEL-PRO BBC Rear Main Seal & STG 2 Buick V6 2&3 Design is a precision-engineered replacement seal specifically designed for Buick V6 engines. This rear main seal is essential for preventing oil leakage at the crankshaft's rear journal, a critical failure point in aging engines where factory seals may have hardened or cracked. Engine builders, restoration specialists, and DIY enthusiasts rely on this seal to eliminate messy oil seepage and protect engine components during maintenance.

Constructed from durable silicone material, the BBC Rear Main Seal features a two-piece architecture that allows for easier installation without requiring full engine disassembly in many applications. The silicone compound resists thermal cycling, maintains flexibility across temperature extremes, and resists degradation from modern detergent oils better than older materials. This design ensures a reliable seal that can withstand the rigors of engine operation.

This seal is ideal for owners performing transmission rebuilds, crankshaft service, or complete engine restorations who cannot tolerate rear main oil leaks. The staged design (STG 2) accommodates both Buick V6 2 and 3 variations, making it a versatile solution for multiple engine generations within the Buick platform family. Proper installation requires careful alignment with the crankshaft diameter and seating in the block's rear recess, so consulting your engine's service manual is recommended.