Parts for your 2020 Mitsubishi Asx-Oil pump

2020 Mitsubishi ASX oil pump — what it does, and when to service or replace it

Yes, the 2020 Mitsubishi ASX uses an engine oil pump. Technical sources confirm this: the Mitsubishi Motors Service Manual for the 4B11/4B12 engines (Group 11A – Engine Lubrication) describes a crankshaft‑driven internal gerotor oil pump integrated into the front case/timing cover, and the MMC ASA Electronic Parts Catalogue lists the front case/oil pump assembly as a service part for ASX/Outlander Sport/RVR of this model year. Workshop data providers also reference the same layout and oil pressure test procedure for the 4B1 series.

On the 2020 ASX, the oil pump’s job is to pull oil from the sump, pressurise it, and send it through galleries to bearings, cams, and the timing chain. That pressure keeps metal parts separated by a film of oil, carries away heat, and helps whisk sludge to the filter. Without a healthy pump, the low oil pressure warning light can appear, and engine wear accelerates quickly.

Good news: the pump itself isn’t a routine service item. It’s built into the front cover and is driven directly by the crank, so it’s robust. What does matter is regular oil and filter changes using the viscosity specified in the owner’s manual (commonly 0W‑20 or 5W‑30 in AU/NZ, depending on climate and spec), quality filters, and not extending intervals. That’s what keeps the pump fed with clean oil and the pick‑up screen clear.

When would an ASX oil pump need attention? If there’s a persistent low oil pressure warning, rattly starts, noisy top end, or verified low pressure on a mechanical gauge, it’s time for diagnosis. A competent tech will first check oil level/grade, the pressure relief valve operation, the pick‑up O‑ring and screen, and bearing clearances before condemning the pump itself.

Replacement, when required, is a front‑end job: the technician removes the drive belts, crank pulley and timing cover/front case assembly, then inspects the gerotor set and housing for scoring and end‑clearance. It’s smart to renew the pick‑up O‑ring, front crank seal, and apply the correct sealant to the front case. The pump should be primed with clean oil during reassembly, and oil pressure verified on first start. Because timing components and sealing surfaces are involved, this is best left to a workshop with the right tools and access to factory specs.

• Stick to proper oil/filters and change intervals.
• Investigate any oil light or rattles straight away.
• Use OEM‑quality parts and correct sealant if the pump/front case is replaced.

Does the 2020 Mitsubishi ASX have an oil pump?

It does. The 4B11/4B12 petrol engines fitted to the 2020 ASX use a crankshaft‑driven internal gerotor oil pump integrated into the front case. This is documented in Mitsubishi’s engine lubrication section of the factory service manual and reflected in parts catalogues.

When should the oil pump be replaced on a 2020 ASX?

There’s no scheduled replacement. It’s only replaced if testing confirms low oil pressure or if damage is found during major engine work. Always verify pressure with a gauge, check oil grade/level, the relief valve, and the pick‑up before calling the pump.

What are the signs of a failing oil pump on a 2020 ASX?

Warning lamp for low oil pressure, noisy valve gear or chain on cold start, and a confirmed low reading on a mechanical pressure test. Don’t keep driving with the oil light on—shut it down and have it checked to prevent bearing damage.