Parts for your 2002 Toyota Hilux surf-Transmission fluid

2002 Toyota Hilux Surf transmission fluid — what it does and when to change it

Transmission fluid absolutely is relevant and used on the 2002 Toyota Hilux Surf. Toyota’s service literature for this model year shows the Aisin automatic gearboxes (A340F/A343F, fitted to many 2002 Surfs) require Toyota ATF Type T‑IV, while manual gearboxes (such as the R‑series) specify a 75W‑90 API GL‑4/GL‑5 gear oil. These specs appear in Toyota owner’s and repair manuals for Hilux Surf/4Runner models of the era and in Aisin’s service data for the A340 family, which call out T‑IV/JWS‑3309 ATF. So whether it’s an auto or a manual, this Surf runs on transmission fluid — just of different types.

In the automatic, ATF does several jobs at once: it lubricates, cools, cleans, protects from wear, and provides the hydraulic pressure that actually applies the clutches and bands. In the manual, the correct gear oil cushions gears, protects synchros, and controls shift feel. Fresh, correct-spec fluid helps the Surf shift smoothly, run cooler, and last longer — especially important for vehicles that tow, tour, or see beach work around AU and NZ.

For a 2002 Hilux Surf automatic, stick with Toyota ATF Type T‑IV. For a manual, use a high‑quality 75W‑90 that meets the API GL‑4/GL‑5 requirement per Toyota’s specs. Many 2002 autos have a dipstick: check level hot, on level ground, engine idling in Park, and look for a healthy red colour without a burnt smell. As a practical service rhythm, a drain‑and‑fill every 60,000–90,000 km is a safe bet for mixed Aussie and Kiwi conditions