| Engine oil & filter | SAE 5W-30 multigrade (5W-30 is the manual's best choice) · 6.5 US qt (6.2 L) with filter | At purchase, then every 5,000 mi / 6 months (2008 Lexus schedule) | Spin-on filter. Replace the drain-plug gasket every time.Oil filter, fits 2UZ-FE · CruiserTeq ↗Oil drain plug gasket, 2UZ-FE · CruiserTeq ↗ |
| Timing belt, water pump & tensioner | Belt, water pump, tensioner and idlers. GXOR's parts list adds a fan pulley bracket, radiator hoses, drive belt, thermostat and radiator cap. | Every 90,000 mi / 108 months (2008 Lexus schedule) | If there's no receipt, assume it's due. Use about two gallons of Toyota Super Long Life pink premix for the refill (GXOR).Aisin timing belt kit with water pump (TKT-021) · CruiserTeq ↗Drive belt, 2005 GX 470 · RockAuto ↗ |
| Coolant | Toyota Super Long Life coolant or equivalent · 13.6 US qt (12.9 L) | First at 100,000 mi / 120 months, then every 50,000 mi / 60 months | Usually done alongside the timing belt and water pump.Coolant, 2005 GX 470 · RockAuto ↗Thermostat, 2UZ-FE (90916-03100) · CruiserTeq ↗ |
| Spark plugs | Denso SK20R11 or NGK IFR6A11 · gap 1.0–1.1 mm | Every 120,000 mi (2008 Lexus schedule) | Replace the spark-plug tube seals if the valve covers come off.Spark plugs, 2005 GX 470 · RockAuto ↗Spark plug tube seal, 2UZ, OEM · CruiserTeq ↗ |
| Air filter | 2UZ-FE panel element | Replace every 30,000 mi. Inspect more often on dusty roads. | If the filter is oily, the factory manual says the PCV valve may be stuck.Air filter, 2005 GX 470 · RockAuto ↗ |
| Cabin filter | Air conditioner filter element | At purchase, then every 30,000 mi / 36 months (2008 Lexus schedule) | Cabin air filter, 2005 GX 470 · RockAuto ↗ |
| Automatic transmission (A750F) | Toyota Genuine ATF WS only · 3.2 US qt (3.0 L) per drain-and-refill, 11.0 US qt (10.4 L) dry fill | At purchase. The schedule only calls for ATF changes when towing (60,000 mi), but GXOR says many owners change it anyway. | A drain-and-fill swaps only about a quarter of the fluid, so do it two or three times. GXOR lists a pan gasket (35168-60010), strainer (35330-60050), strainer O-ring (90301-31014) and drain/fill plug gaskets (35178-30010, two required) if you drop the pan.ATF WS, 2005 GX 470 · RockAuto ↗Transmission pan gasket, 2005 GX 470 · RockAuto ↗ |
| Transfer case | Hypoid gear oil API GL-5, SAE 75W-90 · 1.5 US qt (1.4 L) | At purchase, then every 30,000 mi if you tow (2008 schedule) | Fill until oil reaches within 5 mm of the bottom edge of the filler hole.Transfer case fluid, 2005 GX 470 · RockAuto ↗ |
| Front & rear differentials | Hypoid gear oil API GL-5: SAE 90 above 0 °F, SAE 80W or 80W-90 below · front 1.48 US qt (1.40 L), rear 3.22 US qt (3.05 L) | At purchase, then every 15,000 mi if you tow (2008 schedule) | Rear is the 8 in axle GXOR calls weak. Check the magnetic plug for metal.Gear oil, 2005 GX 470 · RockAuto ↗Front diff drain plug with copper gasket, GX 470/460 · CruiserTeq ↗Front diff drain plug gasket, GX 470/460 · CruiserTeq ↗ |
| Front differential support (2003–early 2005) | Revised passenger-side support, Toyota 52380-60021 (stamped 52391-60021) | Check once at purchase | GXOR says the early support can fail catastrophically and take the oil pan with it. Some 2005s have the updated part from the factory.Support, front differential No. 2 (52380-60021) · Lexus Genuine Parts ↗ |
| Power steering fluid | ATF Dexron II or III · 1.0 US qt (1.0 L) total | Check level and leaks at purchase | Leaks from hoses and the pump can drip onto the rack and look like a rack leak.Power steering fluid, 2005 GX 470 · RockAuto ↗ |
| Brake fluid | SAE J1703 or FMVSS No. 116 DOT 3 | At purchase, then every 30,000 mi (2008 schedule) | Brake fluid, 2005 GX 470 · RockAuto ↗ |
| Propeller shafts & front bearings | Lithium-base chassis grease NLGI No. 2 for the spiders and slide yoke | Grease at purchase. Grease after water crossings. | The factory chassis checklist also calls for repacking the front wheel bearings and the drive-shaft bushing grease. Wipe mud off the fittings before you pump in grease.Red-i hi-temp and moly grease kit (6 tubes) · CruiserTeq ↗U-joint, 120/150 Series front shaft · CruiserTeq ↗ |
| Rear air suspension | Air springs, compressor and height sensor | Inspect at purchase | Check that the truck holds height overnight and listen for the compressor running often. GXOR says the bags will eventually fail, and the usual fix is a coil conversion.Rear air springs, 2005 GX 470 · RockAuto ↗Ride height sensor, 2005 GX 470 · RockAuto ↗ |