What is the model of transmission fluid?

2 Answers
EdwardLynn
07/28/25 6:24pm
The American Petroleum Institute (API) classifies vehicle gear oils into six categories based on performance: GL-1, GL-2, GL-3, GL-4, GL-5, and GL-6. Among these, GL-1, GL-2, and GL-3, which are more suited for heavy-duty applications, have been phased out in the market. Currently, most household vehicles use GL-4 and GL-5 (GL-6 is typically used for buses). More details are as follows: 1. Transmission fluid is an oil product designed to keep the gear system clean, ensuring the proper functioning of the transmission and extending the lifespan of the transmission components. 2. In terms of oil characteristics, the most noticeable difference is that manual transmission fluid is more viscous than automatic transmission fluid. The replacement interval for manual transmission fluid is generally shorter than that for automatic transmission fluid. Most household vehicles require manual transmission fluid replacement every 40,000 to 60,000 kilometers.
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OCharles
08/12/25 12:04am
As a frequent driver, I deeply understand the importance of transmission fluid specifications. I remember the last time I changed the oil myself—I didn’t carefully check the manual and opted for a generic ATF Dexron III, only to experience noticeable gear-shifting hesitation afterward. At the repair shop, I learned my car model specifically required ATF WS fluid. Different vehicles demand different types: common automatic transmission fluids include Dexron VI, Mercon SP, or Type T-IV, while manual transmissions typically use viscosities ranging from 75W-80 to 80W-90. Using generic fluids can lead to errors, potentially causing wear, overheating, and shortened transmission lifespan. Now, I always prioritize checking the owner’s manual or using an app to confirm via VIN, and I stick to a three-year oil change interval—saving money and ensuring peace of mind.
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