How Often Should Transmission Fluid Be Changed for Safety?

[StBriella]

Manual transmissions using mineral oil require fluid changes every 2-3 years or 40,000-60,000 km, while synthetic oil lasts 150,000-200,000 km before replacement. Here are relevant details:1. Dry dual-clutch transmissions share the same structure as manual transmissions, thus also using synthetic transmission fluid with a service life of approximately 150,000 km. Most automatic transmissions need fluid changes every 60,000-80,000 km.2. The transmission fluid replacement interval is only a general guideline. Actual fluid condition may vary depending on road conditions and driving habits. If experiencing gearshift roughness, strong jerking sensations, or significantly increased noise during vehicle operation, inspect whether transmission fluid requires replacement.3. Three common transmission fluid replacement methods exist:(1) Gravity drain: Similar to engine oil changes - remove the drain plug to release fluid, then refill through the filler port. Disadvantage: incomplete drainage.(2) Machine flush: Connect a transmission flush machine to fluid line interfaces, using new fluid to 'push out' old fluid from the transmission. Advantage: thorough replacement. Disadvantage: time-consuming and requires more fluid.(3) Oil pan removal: Allows cleaning/replacement of transmission filter while achieving thorough fluid replacement. Disadvantage: complex procedure.