* The type of transmission: Automatic transmissions generally require more frequent fluid changes than manual transmissions. Manual transmissions rarely need fluid changes unless there's a leak or contamination.
* The manufacturer's recommendations: This is the most important factor. Consult your owner's manual. The recommended service interval will vary depending on the make, model, and year of your vehicle. Some manufacturers specify mileage intervals, while others might recommend time-based changes (e.g., every few years regardless of mileage).
* Driving conditions: Severe driving conditions (frequent towing, stop-and-go traffic, extreme temperatures) can necessitate more frequent fluid changes.
* Fluid condition: If you have the fluid checked (many mechanics will do this as part of a service), and it looks dark, burnt, or smells bad, a change is needed regardless of mileage.
In short: Don't rely on a general mileage number. Always check your owner's manual for the manufacturer's recommended service interval for your specific vehicle. This is the most accurate and reliable information. Ignoring this recommendation can lead to premature transmission wear and costly repairs.
