Can GL-4 Transmission Fluid Be Replaced with GL-5?

1 Answers
OBrayden
07/30/25 9:32am
Transmission fluid GL-4 cannot be replaced with GL-5. The specific choice should be made according to the transmission and the vehicle's user manual. Below are the differences between GL-4 and GL-5 transmission fluids: 1. Different types: GL-4 is a medium-load gear oil, suitable for differential gears, transmission gears, and steering gears; GL-5 is a heavy-load gear oil, suitable for differential gears and rear axle gears under extremely harsh working conditions. 2. Different grades: According to the gear oil classification, GL-5 is of a higher grade than GL-4, and GL-4 is less expensive than GL-5. 3. Different compositions: GL-5 contains more sulfur and is more acidic compared to GL-4.
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