Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Service Intervals
Check fluid level at each engine oil change. When operated under normal conditions, passenger car transmissions do not require periodic service. However, under heavy duty conditions, transmission should be drained, refilled, and bands adjusted every 15,000 miles.
Trucks and Vans used in normal, light duty service require transmission servicing (fluid drained and refilled, bands adjusted) every 37,500 miles. Under normal heavy conditions, service transmission every 24,000 miles. Vehicles subjected to severe heavy duty conditions should have transmission serviced every 12,000 miles.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.