| Engine oil & filter | 10W-30 (above −18°C) or 5W-30 (below 10°C) · 7.8 qt with filter | Then every 3,000–5,000 mi confirm in manual | Drain plug torque is 18 ft-lb. An oil analysis on the first drain gives a useful head-gasket baseline. Look for coolant in the oil.Oil filter 90915-YZZD3 (OILYZZD3) · CruiserTeq ↗ |
| Air filter | 1FZ-FE panel element | Inspect every oil change, more often on dirt roads | Check the intake hose and boot for cracks. IH8MUD regulars list a worn intake hose as a common 80 Series fault.Air filter, FZJ80/LX450 1FZ-FE · CruiserTeq ↗ |
| Spark plugs, wires & distributor | Denso OEM plugs confirm gap in manual | At purchase if no record | The 1FZ-FE uses a distributor and plug wires, so replace the wires with the plugs on an unknown truck. Spark plug tube seals stop oil pooling in the plug wells.Denso OEM spark plugs, FZJ80/LX450 · Cruiser Corps ↗Spark plug wire set, FZJ80/LX450 · Cruiser Corps ↗Spark plug tube seal, 1FZ (VCC15010) · CruiserTeq ↗ |
| Coolant, thermostat & radiator cap | Toyota red coolant · 14.8 qt (front heater) / 15.9 qt (front + rear heaters) | Flush at purchase confirm interval in manual | Overheating is what kills 1FZ head gaskets. Expedition Portal regulars say to use Toyota red only and to check the water pump, fan clutch and thermostat. A replaced radiator or crud in the overflow bottle are clues to past overheating (Slee).Thermostat, 80/100 Series · Cruiser Corps ↗Thermostat gasket, FZJ80/LX450 · Cruiser Corps ↗ |
| Heater and bypass hoses (PHH) | Rubber hoses under the intake, driver's side | Replace at purchase if original | The PHH and the bypass hoses above it can strand you when they fail. Original clamps mean original hoses.Coolant bypass hose, FZJ80/LX450 (RAD16264) · CruiserTeq ↗ |
| Automatic transmission fluid (A343F) | Dexron III-type ATF (AMSOIL lists AF3 for the A343F) · 11.6 qt total fill | Drain-and-fill at purchase | A pan drain only replaces part of the 11.6 qt, so repeat the drain-and-fill a couple of times rather than pressure-flushing an old transmission.Drain & fill plug with gasket (OP18021) · CruiserTeq ↗ |
| Transfer case | GL-4 or GL-5 gear oil · 3.6 pt | At purchase | The center diff is viscous-coupled on these trucks. Note any binding or clunks in tight turns on pavement.Steel drain plug gasket (OPG10010) · CruiserTeq ↗ |
| Front & rear differentials | GL-5 90 (80W-90 below −18°C) · front 5.5 pt with locker / 5.9 pt without · rear 7 pt | At purchase, and after any deep water crossing | If the truck has factory lockers, test them in low range on a loose surface (Slee). Water in the gear oil means bad breathers or seals.Magnetic drain & fill plug with gasket (OP18021) · CruiserTeq ↗ |
| Front knuckles / birfields | Moly grease in the birfields, MP grease in the wheel bearings | Repack at purchase if there's no record | Pull the square knuckle fill plug. Runny grease means diff oil is getting past the inner axle seals (Slee). See the knuckle rebuild above for preload specs.80 Series knuckle rebuild kit (FA9097) · CruiserTeq ↗Front axle birfield seal, 80 Series · Cruiser Corps ↗ |
| Power steering fluid | DEXRON-III ATF | At purchase | Persistent leaks are often the reservoir seals, not the box or the hoses (Unsealed 4X4).Power steering reservoir/suction O-ring (ST11016OR) · CruiserTeq ↗ |
| Brake fluid & pads | DOT 3 hydraulic brake fluid (AMSOIL application guide) | Flush at purchase | Slee reports front pads lasting about 10–15k miles (1997 pads last longer). If the truck has been lifted, the load-sensing proportioning valve needs readjusting.Brake parts (1997 LX450 catalog) · RockAuto ↗ |
| Drive belts | 1FZ accessory belts | Replace at purchase if they're cracked or there's no record | Accessory & drive belt kit, FZJ80/LX450 (BTKFZJ801FZOEM) · CruiserTeq ↗ |
| Driveshafts & U-joints | MP grease at every zerk, including the slip yokes | At purchase and every oil change | Overland Tailor's IH8MUD write-up blames most 80 Series driveline vibrations and clunks on driveshafts that were never serviced.Driveline parts (1997 LX450 catalog) · RockAuto ↗ |
| Fuel filter & PCV valve | OEM fuel filter · PCV valve | At purchase if there's no record confirm interval in manual | Fuel filter, OEM, FZJ80/LX450 · Cruiser Corps ↗PCV valve, FJ62/FJ80/FZJ80 (ENGPCV35040) · CruiserTeq ↗ |