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Red Line MT-90 75W-90 GL-4 Manual Transmission Lubricant, 1 gal (4 pack)

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$344 USD
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Red Line 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon (4 Pack)

GL-4 manual transmission lubricant designed for smoother shifts and longer synchro life. Noted for quiet operation in older manual transmissions, with positive customer feedback on shifting feel

Highlights

  • quicker shifts due to friction characteristics
  • high performance gear protection
  • recommended for GL-1/3/4 applications

Pros

  • smoother shifting in manual transmissions
  • helps longer synchro life
  • quiet operation in older transmissions
  • works across multiple GL ratings
  • suitable for 5-speed applications

Cons

  • mixed views on value for money

Best For

  • older manual transmissions
  • 5-speed manual transmissions
  • GL-1 to GL-4 compatible applications
  • gear oil for manual transaxles
  • transmission lubrication for classic vehicles

Features

  • Suitable for GL-1, GL-3, and GL-4 applications for gear protection and longer synchro life
  • Promotes smoother shifts with optimal synchronizer friction, even when cold
  • Designed for 75W viscosity variants and compatible with 80W, SAE 40, 10W40, and 15W40
  • Safe for brass synchros and lacks reactive sulfurs typical of GL-5 oils

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