Check the Automatic Transmission Fluid

The automatic Hilux uses the AC60F six-speed gearbox, which is a sealed “fill-for-life” unit with no dipstick. You check and set the level through an overflow plug underneath — and crucially, only within a narrow fluid-temperature window, which is why it is really a workshop check rather than a quick driveway job.

Fluid and capacity

• Fluid type: Toyota Genuine ATF WS (no substitutes)
• Total capacity: approx. 9.5 litres (diesel); a drain-and-refill takes less

How the overflow level check works

1. Park the truck dead level on a lift or ramps (within about 1° front-to-rear), engine off.
2. Bring the ATF to the specified temperature window — this is read with a scan tool on the ATF temperature data, because there is no dipstick and the level is temperature-sensitive.
3. With the engine idling and the fluid in range, remove the overflow plug (5 mm hex) from the pan.
4. If a steady trickle runs out, the level is correct. If nothing comes out, fluid is added through the refill plug until it just overflows, then the plug is refitted.
5. Torque the drain plug to 20 N·m and the overflow/refill plugs to spec.

Because getting the temperature window right needs a scan tool reading the transmission data, most owners leave the level check and any top-up to a workshop. Overfilling or underfilling a WS transmission causes harsh shifts and overheating, so guessing is not worth the risk.

FAQ

Where is the dipstick? There isn’t one — the AC60F is sealed. The only check is the overflow-plug method above.

Does ATF ever need changing? Toyota calls it fill-for-life, but many owners change it (drain and refill) around 60,000–100,000 km for heavy or towing use, using ATF WS only.

If a transmission fault code (for example a P07xx) is stored, look it up on autodtcs.com.