| Engine oil & filter | 1VD-FTV: ≈9.5 L with filter, SAE 5W-30 ACEA C2 (Roughtrax; its table mislabels the engine, so confirm) · 1HZ: 9.5 L with filter, API CD (Toyota publications via IH8MUD) | Then per the owner's manual schedule confirm in manual | On post-2016 DPF trucks a low-ash C-spec oil matters; don't fill one with old-school high-ash diesel oil.Oil filter, 1HZ/1PZ/1KZ/1HD (OIL30002) · CruiserTeq ↗1VD oil filter (search; confirm VDJ7x fitment by VIN) · CruiserTeq ↗ |
| Air filter & airbox seal | Inspect the clean side of the filter | Every service, and after every dusty trip | Unsealed: the 1VD airbox seal lets dust past the filter, causing MAF faults and turbo wear. Dust on the clean side means fit a sealed aftermarket airbox now.Scavenger air filter, VDJ 70 Series · FreezeBrain ↗Air filter, 1HZ and others (ENGAF68020) · CruiserTeq ↗ |
| Fuel filter & water separator | Diesel filter element; drain the separator | Replace now if there's no record, then per the manual confirm in manual | Imported or outback-fuelled trucks may have seen dirty diesel; cheap insurance for injectors.Fuel filter, VDJ7x (EGF51030) · CruiserTeq ↗Fuel filter, 1HZ/1HD and others (EGF64010) · CruiserTeq ↗ |
| Coolant | VDJ79: 14.8 L Toyota pink Super Long Life (Roughtrax) · 1HZ: 11.6 L ethylene-glycol with front/rear heaters (Toyota publications via IH8MUD) | Flush now if the color or history is unknown | Don't mix coolant types; check the radiator for packed dust and grass, since a blocked core also kills the AC.Thermostat, 1HZ/1HD (RAD03089) · CruiserTeq ↗ |
| Manual gearbox | V8: GL-4 75W-90 per Unsealed and 70 Series Store, which both warn against GL-5 (Roughtrax lists GL-4 or GL-5) · V8 capacity: Roughtrax says 2.7 L, 70 Series Store about 4.5 L confirm in manual · 1HZ: 4.9 L, GL-4 or GL-5 SAE 90 (Toyota 1991 owner's manual) | Change now on an unknown truck | Unsealed: GL-5's extreme-pressure additives attack the brass synchros, so crunchy 2nd–3rd shifts can be the wrong oil.Red Line MT-90 75W-90 GL-4 gear oil · Red Line ↗ |
| Transfer case | VDJ79: 1.5 L, SAE 75W-90 GL-4/GL-5 (Roughtrax) · 1HZ: 2.2 L, SAE 90 GL-4/GL-5 (Toyota publications via IH8MUD) | Then per the owner's manual schedule confirm in manual | Part-time two-speed case; check for weeps at the output seals. |
| Front differential | VDJ79 with diff lock: 2.8 L, 75W-85 GL-5 (Roughtrax) · 1HZ: 2.6 L, GL-5 (Toyota publications via IH8MUD) | Then per the owner's manual schedule confirm in manual | Check the breathers after any water crossing; milky oil means water got in. |
| Rear differential | VDJ79: 2.4 L, 75W-85 GL-5; LSD axles take Toyota-specific LSD oil (Roughtrax) · 1HZ: 2.5 L, GL-5 (Toyota publications via IH8MUD) | Then per the owner's manual schedule confirm in manual | If the truck has a factory rear locker, test it on a low-traction surface. |
| Swivel hubs & front wheel bearings | Steering knuckles: moly-disulfide lithium grease NLGI-2 · wheel bearings: lithium multi-purpose NLGI-2 (Toyota publications via IH8MUD) | Inspect and re-preload now; service periodically | Unsealed: the tapered-roller hubs often just need the 54 mm locknut nipped up and fresh grease, and owners do the swivels at the same time.Front wheel bearing kit (Koyo), 1998–2019 solid-axle non-US 7x (FAWB9819SAK) · CruiserTeq ↗Front axle rebuild kit, 8/1999–2019 7x non-ABS (FA9919) · CruiserTeq ↗ |
| Power steering fluid | Dexron-II ATF on older 70s (Toyota 1991 owner's manual) · V8: confirm in manual | Refresh if dark | Check the box and hoses for weeps, and the drag link and tie-rod ends for play while you're there. |
| Brake & clutch fluid | DOT 3 or 4, SAE J1703 (Roughtrax) | Flush now, then every 2 years confirm in manual | A soft or high-biting clutch on a tuned V8 is the clutch itself (Unsealed), not the fluid; test it under load. |
| Chassis grease & spring hangers | Propshaft U-joints: lithium-base NLGI-2 (Roughtrax) | At every service | Unsealed says to check the rear spring hangers for cracks at every service, especially on utes that have been run over GVM.OME greaseable spring pin kit, 78/79 rear (OME GP7) · CruiserTeq ↗ |
| Timing belt (1HZ and other belt-driven diesels) | The 1HZ drives its camshaft with a timing belt (Wikipedia) · Toyota's 1991 owner's manual says a timing-belt warning light comes on every 100,000 km on the diesels and the belt should be replaced when it does | Replace now if there's no receipt, then every 100,000 km | Confirm whether your engine uses a belt before budgeting; kits with the water pump are available for the 1HZ.Timing belt kit w/ water pump, 5/1998–8/2007 1HZ HZJ7x/10x (BELTTK027OEM) · CruiserTeq ↗ |
| DPF, alternator & charging (late V8) | Late-2016-on V8s have a DPF (Unsealed) | A spirited highway run every 1,000–2,000 km | Unsealed: short-trip DPF trucks clog. Rinse the low-mounted alternator with a low-pressure hose after muddy trips, and fit a DC-DC charger for big auxiliary batteries.Jaylec 65-8594EP 130 A corrosion-protected alternator, VDJ · FreezeBrain ↗ |