What are the models of manual transmission fluid?
2 Answers
Manual transmission fluids are classified into six categories based on performance: GL1, GL2, GL3, GL4, GL5, and GL6. Manual transmission fluid, commonly referred to as gear oil, is primarily used for lubrication. In terms of oil characteristics, manual transmission fluid has a higher viscosity compared to automatic transmission fluid, and its replacement interval is generally shorter. Most household vehicles require manual transmission fluid replacement every 40,000 to 60,000 kilometers. There are various models of ATF (Automatic Transmission Fluid), each with different friction coefficients. Some car manufacturers select specific oil models based on the technical specifications of the vehicle's transmission. Using such oils helps maintain the transmission's mechanical performance and prolong its lifespan.
I've been driving manual transmission cars for over a decade and have accumulated considerable experience in selecting transmission oil. The specification of manual transmission fluid is quite important, primarily the API classification. For instance, GL-4 is suitable for most regular sedans as it protects synchronizers; GL-5 offers higher pressure resistance and is more appropriate for pickups or SUVs, but these shouldn't be mixed arbitrarily as it might corrode components. Pay attention to viscosity grades too - 75W-90 is the most common, with 75W being better for cold climates to ensure smoother flow and prevent stiff gear shifts in winter. When selecting oil, I always check the vehicle manual to confirm specifications. Quality varies among brands like Shell or Mobil, so I recommend purchasing certified products. The replacement interval is typically every 50,000 kilometers. I regularly inspect the fluid condition - excessively dirty oil can lead to rough shifting or increased noise, so timely replacement can save major repair costs. The whole process isn't difficult, the key is matching the specification to your vehicle model.
