Parts for your 2004 Toyota Highlander-Oil pump

2004 Toyota Highlander (Kluger): Oil pump purpose and service tips

Yes, the 2004 Toyota Highlander (sold as the Kluger in Australia and New Zealand) absolutely uses an engine oil pump. Both the 2.4L 2AZ‑FE four-cylinder and the 3.3L 3MZ‑FE V6 are factory-fitted with a trochoid-style pump driven directly by the crankshaft. This is detailed in Toyota’s Repair Manual (Engine Mechanical, Lubrication System sections for 2AZ‑FE and 3MZ‑FE) and the Toyota New Car Features documents covering these engines, which describe the pump, pressure relief valve, pick-up screen and oil galleries that supply bearings, camshafts and the VVT‑i system.

The oil pump’s whole job is to circulate clean oil at the right pressure through the engine so every moving bit—crank bearings, rods, cams and the VVT‑i actuators—stays lubricated and cooled. On these Highlander/Kluger engines, proper oil pressure is especially important for VVT‑i timing control, cold-start protection and overall longevity.

As for maintenance, the pump itself isn’t a scheduled service item, but looking after it is all about keeping the oil clean and the pick-up free of sludge. Stick to regular oil and filter changes with the correct grade (typically 5W‑30 meeting the spec listed in the owner’s handbook, some climates may allow 10W‑30). A quality filter helps the pump maintain healthy pressure and reduces bypass events on cold starts.

If low oil pressure is suspected, confirm with a mechanical gauge before pointing the finger at the pump. Common causes include low oil level, a clogged pick-up screen, thin or incorrect oil, a stuck pressure relief valve or excessive internal clearances from wear. Replacing the pump on these engines involves removing the sump and front timing cover, resealing with the correct FIPG sealant, installing new O‑rings, and priming the pump with clean oil before first start. After reassembly, crank with ignition disabled to build pressure, then check for leaks and verify pressure at hot idle.

• Watch for warning signs: oil pressure light flickering at idle, rattly top-end on cold start, VVT‑i fault codes, or bearing knock under load.
• Don’t delay diagnostics—running with low pressure can quickly damage bearings and cams.
• Use proper sealants and torque procedures if the front cover or pump is off, shortcuts lead to leaks and aeration.

Popular questions

Does a 2004 Highlander/Kluger definitely have an oil pump?

Yes. Both the 2AZ‑FE and 3MZ‑FE engines use a crank-driven trochoid oil pump. This configuration is outlined in Toyota’s engine mechanical and lubrication system service information and the New Car Features guides for those engines.

When should the oil pump be replaced on a 2004 Highlander?

There’s no routine replacement interval. Replace it only after verified low oil pressure and after ruling out oil level, viscosity, filter issues, pick-up blockage and relief valve faults. Always confirm pressure with a mechanical gauge before authorising the job.

What oil should be used to protect the pump and VVT‑i?

Use the viscosity specified in the owner’s handbook—commonly 5W‑30 meeting the applicable API/ILSAC spec. In hotter regions, 10W‑30 may be acceptable. Quality oil and timely changes are the best insurance for pump performance and VVT‑i health.