Changing the oil and filter in an automatic transmission (without removing the crankcase)

Partial Automatic Transmission Fluid (ATF) Change (Without Pan Removal)

A partial ATF change (drain and fill) is a gentle and effective way to refresh the transmission fluid. This method involves draining the old fluid through the drain plug and refilling it with fresh fluid to the required level. It helps restore the additive package and improves the thermal stability of the transmission.

When is this service recommended?

• Routine maintenance every 30,000 – 40,000 km.

• After purchasing a used vehicle with unknown service history.

• If the fluid has darkened but does not have a burnt smell.

• Preventive care for "sealed" transmissions where the filter is inaccessible without disassembly.

What is included in the service:

1. Draining the old transmission fluid (ATF) via the drain plug.

2. Inspecting the drained fluid for debris or metal particles.

3. Replacing the drain plug crush washer.

4. Refilling with fresh fluid that meets the manufacturer's specifications.

5. Checking and adjusting the fluid level at operating temperature.