How to Check if Transmission Fluid Needs Replacement
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Methods to determine if transmission fluid requires replacement: 1. Increased gearshift jerking sensation; 2. Noticeable jerking during driving or abnormal noises from the transmission when the engine is cold. The recommended replacement interval for transmission fluid is approximately 40,000 to 80,000 kilometers. As an essential lubricant for maintaining cleanliness in the gear system, its functions include: 1. Ensuring proper transmission operation; 2. Prolonging the service life of transmission components; 3. Providing effective lubrication at low temperatures; 4. Minimizing fluid loss under severe operating conditions. Based on transmission structure, transmission fluids are categorized into: automatic transmission fluid (ATF) and manual transmission fluid. The transmission system consists of: gear transmission mechanism and gearshift control mechanism.
I usually refer to the owner’s manual first, which states that the transmission fluid should be checked every 20,000 to 30,000 kilometers or every two years. If you notice rough shifting, obvious jerking when starting, or difficulty engaging gears in a manual transmission after prolonged use, it’s likely due to degraded fluid. Most manual transmissions have a dipstick—after parking on level ground and turning off the engine, wait a few minutes, pull it out, wipe it clean, reinsert it, and then check the fluid level and color. The fluid should be light brown; if it turns black, contains metal particles, or smells burnt, it’s time for a change. Automatic transmissions often lack a dipstick, so it’s best not to DIY—mistakes are easy to make. A professional inspection at a repair shop is more reliable. Never wait until you hear strange noises or see a warning light—repairing a damaged transmission can be costly and troublesome.