What is the transmission fluid model?
2 Answers
Transmission fluid types: Depending on the structure of the vehicle's transmission, transmission fluids can be divided into automatic transmission fluid (ATF) and manual transmission fluid. 1. Automatic Transmission Fluid (ATF): This is a specialized fluid for automatic transmissions. The American Petroleum Institute (API) classifies gear oil performance into levels such as GL-1, GL-2, GL-3, GL-4, GL-5, and GL-6. There are many types of ATF fluids, each with different friction coefficients. Some automakers select specific fluids based on the technical specifications of the transmission to maintain optimal mechanical performance and extend its lifespan. In China, commonly used ATF fluids include DEXRON, DEXRON-II, DEXRON-I (produced by General Motors), and ATF-F (produced by Ford). Domestically developed fluids include No. 8 (mainly for passenger car hydraulic automatic transmission systems) and No. 6 (mainly for engine vehicles and heavy-duty truck torque converters). For Chinese automatic vehicles, No. 8 fluid or DEXRON-II can be used. Japanese and European vehicles are recommended to use DEXRON or DEXRON-II. Some manufacturers also offer transmission fluids specifically matched to their vehicle models. 2. Manual Transmission Fluid (Gear Oil): Gear oil packages are labeled with corresponding performance grades. Heavier-duty grades like GL-1, GL-2, and GL-3 have been phased out, while GL-4 and GL-5 are commonly used for household vehicles today.
Transmission fluid specifications are not universal; they depend on your vehicle model and transmission type. Automatic transmissions commonly use ATF fluids, such as Dexron VI or Mercon LV, while manual transmissions may require GL-4 or GL-5 gear oil. Different brands have specific requirements—for example, Toyota uses ATF WS, and Honda uses DW-1. The right choice depends on your car's age and driving habits; newer vehicles perform better with updated fluid standards. I often help friends check their manuals because using the wrong fluid can cause rough shifting or even transmission overheating and damage. It's best to verify the correct fluid using your VIN on the manufacturer's website or consult a dealership. Don’t cheap out and buy the wrong type—repairs can cost tens of thousands.
