| Engine oil & filter | API SG/SH or ACEA A2:96, SAE 5W-40 or 5W-50 · ≈5.8 L drain & refill (6.6 L dry) | At purchase, then every 5,000–6,000 mi | Check the dipstick for mayonnaise and the expansion tank for oil. Either one points to head-gasket or liner trouble.Mahle short oil filter (P38 4.0/4.6) · Lucky8 ↗Sump drain plug washer (4.0 V8) · Lucky8 ↗ |
| Air & cabin filters | OE-type engine air element, plus the pollen/cabin filter pair | At purchase | Clogged pollen filters affect the climate control and can look like a blend-motor fault (see repairs).P38 engine air filter · Rovers North ↗Cabin pollen filter set LR030219 (P38) · Lucky8 ↗ |
| Spark plugs & leads | Plug type and gap per manual confirm in manual | At purchase if there's no record | Misfires on Bosch trucks often come from the leads and coils. Replace the plugs and leads as a set.NLP100320 spark plug (Discovery II / P38) · Lucky8 ↗Magnecor ignition lead set, Bosch 4.0/4.6 · Lucky8 ↗ |
| Fuel filter | V8: OE-type EFI filter confirm in manual. 2.5 DSE diesel: STC2827 | At purchase | Do the diesel filter at purchase on non-US 2.5 DSE trucks.P38 V8 fuel filter · Rovers North ↗STC2827 diesel fuel filter (P38 2.5 DSE) · Lucky8 ↗ |
| Coolant, hoses & thermostat | 50/50 ethylene glycol antifreeze and water · ≈11.4 L | At purchase, then every 2 years | Replace the hoses, thermostat and expansion-tank cap as a set (see repairs). There's no bleed screw. Warm the engine, let it cool, then top up.Radiator hose kit (P38) · Lucky8 ↗Thermostat & housing (P38) · Lucky8 ↗ERR4996 viscous fan clutch (P38 / D2) · Lucky8 ↗ |
| Automatic transmission (ZF 4HP22 on 4.0 / diesel, 4HP24 on 4.6) | Dexron III ATF · ≈11 L total fill (4HP24 figure; 4HP22 confirm in manual). A drain and refill takes about 5 L | Drain and refill at purchase. Repeat after a few hundred miles | An owner on rangerovers.pub measured about 5 L from a drain and refill. Two drain-and-fills refresh most of the fluid without the risk of a flush.ZF 4HP24 pan filter and gasket · Rovers North ↗ |
| Transfer box (Borg Warner 44-62 Hi/Lo) | Dexron III ATF · ≈2.0 L drain & refill (2.4 L dry) | At purchase | Range-change faults ('Select Neutral') are usually electrical or an XYZ switch problem, not low oil. See repairs.P38 transfer box drain/fill plugs and seals · Rovers North ↗ |
| Front & rear differentials | Hypoid gear oil, API GL-5 confirm grade in manual · ≈1.6 L each drain & refill (1.7 L dry) | At purchase, then every 2 years | Fill to the level plug on level ground. Check the pinion seals.P38 differential drain/fill plugs · Rovers North ↗ |
| Front ball joints (no oil-filled swivels) | Sealed ball joints. There's no swivel oil or grease to change | Inspect at purchase | Unlike the Classic and Defender, the P38 front axle uses press-fit ball joints. Check them for play while the wheels are off.Lemförder ball joint set ×4 (P38) · Lucky8 ↗ |
| Power steering | Dexron III ATF (or Texamatic 9226) · ≈1.7 L | Check at purchase | Check the steering box and the PAS cooler pipes for weeps.P38 power steering hoses · Rovers North ↗ |
| Brake fluid | DOT 4 | At purchase, then every 2 years | An ABS pump that keeps running, or ABS warnings, need diagnosis with a Nanocom or a similar tool.P38 brake hoses · Rovers North ↗ |
| EAS air suspension | System runs at about 10 bar / 150 psi. No fluid | Leak-test at purchase. Drain any water from the reservoir and check the dryer | Park overnight at normal height and check each corner in the morning. Spray soapy water on the springs and valve block to find leaks (see repairs). Never work under a truck resting on deflated springs.Dunlop front air spring set (P38) · Lucky8 ↗P38 EAS air dryer and valve block seals · Rovers North ↗ |
| Drive belt | Poly-V serpentine belt | At purchase | Inspect the tensioner and idler pulleys while the belt is off.PQS101640 serpentine belt (P38) · Lucky8 ↗ |
| Propshafts & UJs | Multipurpose lithium grease | At purchase | Grease the UJs and sliding joints. Worn UJs feel like a clunk on take-up.P38 propshaft universal joints · Rovers North ↗ |