Fel-Pro BS40591 is a rear main seal gasket for selected GM 2.3L and 2.4L engines used across Buick, Chevy, Oldsmobile, and Pontiac platforms from the late 1980s through early 2000s. It seals the rear of the crankshaft to help control engine oil leaks, protect oil level, and keep contaminants from entering the sealing area. Application-specific engineering, rubber construction, and OE-level fit validation make it a practical choice for engine reseal work.

Fel-Pro BS40591 Features:

• 1-piece rear main seal design supports a direct repair for the rear crankshaft sealing point.
• Rubber sealing material is built for engine operating conditions, including heat cycling and crankshaft rotation.
• Application-specific design is manufactured for the listed GM 2.3L and 2.4L vehicle applications rather than a universal fit.
• Meets or exceeds OE specifications and is validated for fit, form, and function before release.
• Helps reduce oil loss at the back of the crankshaft and supports cleaner engine operation after a proper installation.

Includes:

• 1-piece rubber rear main seal

Use during rear main seal service, engine resealing, or crankshaft seal replacement when oil is leaking from the rear of the engine. Follow the vehicle service procedure and inspect related sealing surfaces before installation.

Fits select applications including Buick Skylark; Chevy Beretta, Cavalier, and Malibu; Oldsmobile Achieva, Alero, Calais, Cutlass Calais, and Cutlass Supreme; and Pontiac Grand Am, Grand Prix, and Sunfire with 2.3L or 2.4L engines. Confirm engine size, model year, and vehicle application before ordering.