The timing for changing transmission fluid depends on the type of transmission, driving conditions, and manufacturer recommendations:
- For automatic transmissions, a common recommendation is to change the fluid every 60,000 to 100,000 miles, with some manufacturers suggesting around 50,000 to 60,000 miles or every two years. Severe driving conditions like heavy traffic, towing, or extreme climates may require more frequent changes, about every 30,000 to 45,000 miles.
- For manual transmissions, fluid changes are typically recommended every 30,000 to 60,000 miles, though some manufacturers suggest up to 90,000 km (about 56,000 miles). In intense driving conditions, it may be necessary to change the fluid more often, sometimes as frequently as every 25,000 miles.
- It's important to check the transmission fluid regularly, and if it appears dark, contaminated, or has metallic flecks, it may be time for a change even if the mileage interval hasn't been reached.
- When changing the fluid, especially in high-mileage vehicles, a simple drain and refill with a filter change is often recommended over a full flush to avoid dislodging debris that could cause transmission issues.
Following the vehicle manufacturer's maintenance schedule is best, and if the car is kept for a long time or used harshly, changing the transmission fluid at around 100,000 miles or sooner can help extend the transmission's life and prevent costly repairs.
