The Volvo Parts, Accessories &
Performance Specialists Since 1963

Redline MTL - Manual Transmission Oil

Redline 50204 - 106979

Item Number
Mfr Part Number
Brand Classification
Units Per Car
75W80 GL-4
Product Group
Performance parts

Product Description


This 75W80 GL-4 Gear Oil (approximately SAE 5W30/10W30 engine oil viscosity) is designed for use in manual transmissions and transaxles. Provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting.

  • Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage
  • Offers quicker shifts, perfect synchronizer coefficient of friction
  • Eliminates notchy shifting, even when cold
  • High performance gear protection and longer synchro life
  • Satisfies the gear oil viscosity requirements of 75W, 80W, and motor oil viscosities of SAE 30, 10W30, and 5W30
  • Recommended for GL-1, GL-3, and GL-4 applications as well as where most special synchromesh fluids are specified
  • Not for use in differentials with hypoid gears

Redline MTL closely matches the viscosity and friction characteristics of the factory Volvo manual transmission gear oil for M56 and M66 manual transmissions, 31280771. For these applications, we consider it an upgrade to the OE fluid, with the full synthetic base stocks and high viscosity index giving excellent performance in cold weather.

About Redline

We love the Red Line products for their performance capabilities and ease of use. 

We will let Red Line describe what they are about:

"In 1979, Red Line Synthetic Oil began creating lubricants for the racing industry. Today, we manufacture more than 100 quality products, including motor oils, gear oils, assembly lubes, fuel additives and our popular WaterWetter cooling additive for the automotive, motorcycle, marine and industrial markets.

Using cutting edge technology, Red Line responds to the technical challenges of today’s performance industry. We are enthusiasts that stay on top of each market niche, ensuring product recommendations that result in serious performance gains. We use this knowledge of racing to create high-performance products for track cars and street vehicles. Red Line products perform and protect better than any on the market. No compromises."

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