Parts for your 2015 Mitsubishi Asx-Oil pump

2015 Mitsubishi ASX oil pump – what it does, why it matters, and how to look after it

Yes, the 2015 Mitsubishi ASX is fitted with an engine oil pump. Technical sources including Mitsubishi Motors workshop manuals for the 4B1-series 2.0 petrol and 4N1-series diesel detail a crankshaft-driven trochoid/gerotor pump integrated into the front case or balance module. These documents outline the pressurised lubrication circuit and pressure relief valve design, confirming the oil pump is fundamental to the ASX’s engine.

The oil pump’s job is simple but critical: pull oil from the sump and push it under pressure through galleries to crank and cam bearings, timing components, MIVEC/DOHC hardware, and (on some engines) piston cooling jets. This pressurised film keeps metal parts from touching, carries heat away, and sweeps debris to the filter. Without a healthy pump, oil pressure drops and the engine can wear fast or seize.

For servicing of your 2015 Mitsubishi ASX oil pump, there’s no routine “pump replacement” schedule. Instead, keep the pump happy by sticking to regular oil and filter changes with the viscosity and specification shown in the owner’s manual (commonly 0W‑20 or 5W‑30 for petrol, low‑SAPS 5W‑30 meeting the correct ACEA spec for diesel). Fresh, correct oil is the best insurance against pump wear and varnish.

• Watch for warning signs: oil pressure light, rattly starts, ticking lifters, VVT/MIVEC faults, metallic glitter in drained oil, or a blocked pickup screen.
• If the sump’s been off or the engine’s been rebuilt, prime the pump with clean oil before first start.

If the pump does need replacing, it’s a proper job: the front timing cover and crank pulley come off, seals and gaskets are renewed, and clearances are checked against workshop specs. Good practice includes inspecting the pickup and O‑ring, cleaning the pressure relief valve, using the correct sealant on the front cover, and verifying oil pressure with a mechanical gauge on first fire-up. Labour time varies with engine and equipment but expect several hours on the hoist. As the manuals for the 4B1 and 4N1 engines note, correct reassembly and sealing are vital to maintain pressure and avoid leaks.

• Tip: If you’re already in there for a timing chain/belt service or front cover reseal, that’s the ideal time to assess the oil pump for wear.

Popular questions about the 2015 Mitsubishi ASX oil pump

Does a 2015 Mitsubishi ASX have an oil pump?
Yes. Both the 2.0‑litre petrol (4B1 series) and diesel (4N1 series) engines use a crank-driven internal oil pump. Mitsubishi’s engine workshop manuals describe the trochoid/gerotor pump and lubrication circuit in detail, so it’s very much part of the car’s design.

When should the oil pump be replaced on an ASX?
It isn’t a scheduled service item. Replacement is considered if there’s confirmed low oil pressure, pump wear or scoring, a stuck relief valve, or as part of a rebuild. Proper diagnosis with a mechanical gauge beats guessing from a dash light alone.

How long does an ASX oil pump replacement take?
Plan on several hours because the front timing cover and related components have to come off. Time varies with petrol vs diesel and workshop setup. New seals, correct sealant, and priming the pump are key to a good result.