Best Transmission Fluid For High Mileage in 2022 [*Top Picks*]

Looking for the best transmission fluid for high mileage on the market? We’ve got you covered. Check out our ratings of absolute bestsellers below and make a final decision.

3694 Reviews Scanned

  • Castrol 03518 Transmax ATF Green High Mileage Transmission Fluid - 1 Gallon
    Bestseller #1
    Castrol 03518 Transmax ATF Green High Mileage Transmission Fluid - 1 Gallon (386)
      Engineered to help alleviate typical problems experienced by transmissions with over 75,000 miles such as leaks and rough shifts Greater frictional durability provides superior transmission performance Additional seal conditioners to prevent or help stop leaks Extra cleaning agents to reduce varnish and sludge formulation Protects against clutch wear and restores smooth shifting Greater frictional durability provides superior transmission performance Meets or Exceeds General Motors DEXRON-IIIH Requirements; Meets or Exceeds Ford MERCON Requirements Exceeds all passenger car and light truck manufacturer’s warranty requirements for vehicles, transmissions or power steering service where a DEXRON-IIIH or MERCON type ATF is specified
  • Bestline Transmission & Hydraulic Systems Treatment - 12 Fl. Oz. - High Performance High Mileage Transmission Fluid - Lubricant Made with Nano Diamond Technology
    Bestseller #1
    Bestline Transmission & Hydraulic Systems Treatment - 12 Fl. Oz. - High Performance High Mileage Transmission Fluid - Lubricant Made with Nano Diamond Technology (45)
      BOOST THE EFFICIENCY OF ANY TRANSMISSION OIL -Enjoy improved lubricant performance with our innovative transmission oil additive. Using diamond nano-particles technology, our additive provides anti-wear and antifriction properties that are superior to plain transmission repair fluid. ENHANCES THE ADDITIVES IN ALL ATF FLUIDS - Enhance any manual transmission additive or transmission assembly lubricant by helping prevent the oxidation of the additives in all ATF fluids. Our product also conditions all seals and O-rings for optimized effectiveness. EXTENDS THE LIFE OF ALL AUTOMATIC TRANSMISSIONS - The anti-scuffing and anti-wear properties of nano-diamonds make this the perfect transmission fix for lubricants used in cars, race engines, motorcycles, and any other vehicles. EASY AND ECONOMICAL MAINTENCE - Enjoy an overall improved driving performance and help reduce CO2 emissions by boosting the fuel efficiency of your vehicle with our effective transmission treatment additive. TRUSTED QUALITY AND PERFORMANCE - All Best Line Racing products are proudly made in the USA by transmission professionals looking to increase the fuel efficiency and running power of vehicles while lowering your costs.
  • Bar's Leaks High Mileage Transmission Repair, 16.9 Fl Oz
    Bestseller #1
    Bar's Leaks High Mileage Transmission Repair, 16.9 Fl Oz (386)
      Restores performance Stops slipping and prevents lazy shifts Quiets noise Stops leaks Conditions seals and o-rings
  • Rislone High Mileage Transmission Stop Slip with Leak Repair,Pack of 1,4502
    Bestseller #1
    Rislone High Mileage Transmission Stop Slip with Leak Repair,Pack of 1,4502 (386)
      Restores performance Quiets noise Stops leaks Stops slipping and prevents lazy shifting Conditions seals and prevents future leaks
  • Slick 50 41806015 Recharged High Mileage Automatic Transmission and Engine Treatment, 15-Ounce , black
    Bestseller #1
    Slick 50 41806015 Recharged High Mileage Automatic Transmission and Engine Treatment, 15-Ounce , black (386)
      Helps eliminate transmission shudder Restores ATF additive content and provides additional protection to transmissions Prevents transmission leaks and aids high mileage transmissions by lubricating seals Can be added anytime or while doing a transmission fluid change, leave adequate fill space Helps erratic shift and loss of torque
  • K&W 402916X6 Trans-X High Mileage Automatic Transmission Treatment - 16 Fl Oz Leak Repair Solution for Automotive, Power Steering, Hydraulic Systems | Car Care Fluids
    Bestseller #1
    K&W 402916X6 Trans-X High Mileage Automatic Transmission Treatment - 16 Fl Oz Leak Repair Solution for Automotive, Power Steering, Hydraulic Systems | Car Care Fluids (1667)
      K&W SEALANTS & SOLUTIONS: From head gaskets and engine blocks to automatic transmissions and power steering, K&W products are made to stop leakage in aging vehicles. Our sealants provide an effective alternative to costly repairs and parts replacements. TRANS-X LEAK REPAIR FLUID: Specially developed for vehicles with 75,000 miles or more, this automatic transmission fluid extends the transmission life, stops leaks, repairs leaks, prevents future leaks & restores smooth shifting. APPLICATION RANGE: Our leak stop fluid is formulated to prevent and restore smooth shifting in vehicles with high mileage. Trans-X is not compatible with CVT or manual transmissions. SAFE HANDLING: Highly flammable transmission stop slip must be stored in a well-ventilated place away from heat, sparks, and open flame. Wear appropriate personal protective equipment such as safety glasses and gloves. PRODUCT SPECIFICATIONS: Trans-X High Mileage Transmission Fluid is available with 16 Fl Oz fill.
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