How Often Should the Transmission Fluid of a Small Car Be Replaced?
2 Answers
Small cars should have their transmission fluid replaced every 40,000 kilometers. The functions of transmission fluid include: 1. Heat dissipation: The interaction between gears generates a significant amount of heat, which requires lubrication for cooling; 2. Lubrication: Ensures smoother gear engagement; 3. Cleaning: Maintains the cleanliness of the gear system and prolongs the lifespan of the transmission components. The transmission primarily refers to the car's gearbox, which is divided into manual and automatic types. Manual transmissions mainly consist of gears and shafts, achieving speed and torque changes through different gear combinations; automatic transmissions (AT) are composed of a torque converter, planetary gears, and a hydraulic control system, achieving speed and torque changes through hydraulic transmission and gear combinations.
When I changed my car's transmission fluid before, I realized you can't just guess the mileage interval—it varies significantly between vehicles. For regular manual transmissions, it's recommended to change every 30,000 to 60,000 kilometers, while automatics might go 80,000 to 100,000 kilometers. But it depends on driving conditions—frequent stop-and-go traffic or hill climbing wears fluid faster, and aggressive driving or heavy loads mean earlier changes. Always check the fluid color; if it turns black and smells burnt, it's oxidized and could damage the transmission, leading to failure or breakdowns. I strictly follow the manufacturer's manual and consult mechanics—don't trust random online advice. Proper maintenance saves money long-term and keeps the car running smoothly for years.
