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

2 Answers

OBrayden

07/30/25 1:32am

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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JaylaLee

08/15/25 7:15am

I remember when I was young and working on cars, a friend of mine once put GL-5 oil into a manual transmission. Within just a few months, the synchronizers started making clunking noises, and the repair bill was shockingly expensive. GL-4 oil is specifically designed for transmission synchronizers, with milder additives, while GL-5 is used in differentials where the load is higher and the additive concentration is stronger. Using it in a transmission for too long can corrode copper components. This isn't just a noise issue—it can also lead to rough shifting or even gear jamming. The manufacturer's manual emphasizes that using the specified oil is key to protecting the transmission, so never cut corners by mixing oils. I later developed the habit of checking the vehicle manual or scanning the model with an app before every oil change. This small step can save you from major repair headaches. If you have an oil bottle on hand, just read the label carefully to tell them apart.

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