10 Best Rear Main Sealer of December 2025

• Guaranteed Permanent Seal
• Restores Dried, Cracked and Shrunken Seals
• Works in Gas or Diesel Engines

BlueDevil Products

• Rear main bearing oil seal installation set
• Application-specific design ensures a perfect fit
• Meets or exceeds all original equipment specifications
• Engineered and manufactured specifically for repair applications
• Validated for fit, form and function

Fel-Pro

• Guaranteed Permanent Seal
• Restores Dried, Cracked, and Shrunken Rubber Seals
• Works in Manual or Automatic Transmissions

BlueDevil Products

• Permanent Seal 
• Restores Dried, Cracked, and Shrunken Rubber Seals 
• Works in Gas or Diesel Engines

Blue Devil

• Rear main bearing oil seal installation set
• Application-specific design ensures a perfect fit
• Meets or exceeds all original equipment specifications
• Engineered and manufactured specifically for repair applications
• Validated for fit, form and function

Fel-Pro

• Use to stop all leaks in main bearings, transmissions, power steering units, differentials, rack and pinion and any hydraulic fluid system
• Non-clogging and will not harm any seals
• Restores flexibility, elasticity and strength of rubber seals
• Does not contain petroleum distillates
• Hapco Products #1 seller since 1960

Hapco Products Co.

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.

BlueDevil Products

• Fit Type: Universal

Lucas Oil

• Professional strength fast acting resealer, stops leaks fast
• Rejuivinates all rubber seals & gaskets in engines, transmissions, power steering, differentials and hydraulic systems
• Compatible with conventional and synthetic oils, ATF, gear oil, power steering fluids and hydraulic oil
• Does not contain petroleum distillates, will not over-swell or breakdown seals
• 8oz bottle will treat a 6 quart capacity, adjust accordingly

ATP Automotive

• Kit Includes (2) 16oz. Bottles of Marvel Mystery Oil additive
• Cleans and lubricates fuel injectors and carburetors
• Reduces and prevents varnish and gum build-up
• Prevents valve sticking and clatter
• Prevents oil breakdown caused by extreme temperatures

Marvel Mystery Oil