Honda Acty — Transmission Fluid
Manual transmission MTF and front differential GL-4 fluid specifications and change procedure.
Note:The Honda Acty uses two separate fluid sumps on 4WD (HA4) models: the main manual transmission and a front differential unit. Both should be serviced together. 2WD models (HA3) have a combined transaxle and rear differential.
Manual Transmission
Fluid Type
GL-4 75W-90 or Honda MTF
Capacity
1.3 qt / 1.2 L
Fill Plug Size
17 mm hex
Drain Plug Size
17 mm hex
Change Interval
Every 40,000 km (25,000 mi)
Compatible Manual Transmission Fluids
| Brand | Part Number | Notes / Info |
|---|---|---|
| Honda | MTF | OEM Honda Manual Transmission Fluid — preferred |
| Redline | MT-90 | GL-4 75W-90 — widely used substitute |
| Valvoline | VV975 | Full Synthetic GL-4 75W-90 |
| Amsoil | MTG | Manual Transmission & Transaxle Gear Oil 75W-90 |
Front Differential (HA4 4WD Only)
Fluid Type
GL-4 75W-85
Capacity
0.48 qt / 0.45 L
Fill Plug Size
17 mm hex
Drain Plug Size
17 mm hex
Warning:Do not use GL-5 gear oil in the manual transmission or front differential. GL-5 contains sulfur additives that are corrosive to the yellow metal synchronizer rings used in these transmissions. Always verify the GL rating before filling.
Compatible Front Differential Fluids
| Brand | Part Number | Notes / Info |
|---|---|---|
| Redline | GL-4 75W-85 | Front differential — 0.48 qt capacity |
| Royal Purple | Synchromax | GL-4 compatible — 75W-85 |
| Amsoil | SVG | Severe Gear 75W-90 GL-4 |
Drain & Fill Procedure
Manual Transmission
- Warm the truck up first — warm fluid drains faster and carries more suspended contaminants out with it. Park on a level surface and shut the engine off.
- The engine and transmission are accessed through the removable panel in the center of the truck bed. Remove the four bolts and lift the panel out.
- Locate the fill plug on the side of the transmission case. Remove it first — if the fill plug is seized and you drain the fluid before opening it, you will have no way to refill.
- Remove the drain plug and allow the old fluid to drain completely into a suitable container.
- Reinstall the drain plug and torque to approximately 3.0–3.5 kg·m (22–25 ft·lb).
- Fill with 1.3 qt (1.2 L) of GL-4 75W-90 or Honda MTF through the fill plug opening. Fill until fluid just begins to weep out of the fill hole — this is the correct level.
- Reinstall the fill plug and torque to 3.0–3.5 kg·m (22–25 ft·lb).
Front Differential (HA4)
- Locate the front differential unit, forward of the transmission on the driver's side.
- Remove the fill plug on the side of the differential case first.
- Remove the drain plug and drain the old fluid.
- Reinstall the drain plug.
- Fill with 0.48 qt (0.45 L) of GL-4 75W-85 until fluid reaches the bottom of the fill plug threads.
- Reinstall the fill plug.
Tip:Use a fluid pump or squeeze bottle with a flexible hose to fill both sumps — the fill openings are in tight locations and direct pouring is difficult without spillage.