Parts for your 2019 Toyota Hiace-Sump plug washers

2019 Toyota HiAce sump‑plug‑washers — what they do and when to replace them

Technical sources confirm the 2019 Toyota HiAce is designed to use a sump‑plug washer (also called an oil drain plug gasket). Toyota’s Repair Manual for HiAce H300 (2019–) shows the engine oil drain plug fitted with a replaceable gasket and specifies a tightening torque of 39 N·m. The Toyota Electronic Parts Catalogue (EPC) lists the oil drain plug gasket as an aluminium crush washer, commonly part number 90430‑12031 (12 mm), for 2019 HiAce engines supplied to ANZ, with some market variants noting a copper option (e.g., 90430‑12028). So, yes—sump‑plug‑washers are relevant and fitted on the 2019 Toyota HiAce.

On this HiAce, the sump‑plug‑washer is a simple, single‑use sealing ring that sits between the sump and the drain plug. When the plug is torqued, the soft aluminium (or copper) washer deforms slightly to create a reliable seal. That crush is what stops annoying weeps and protects the alloy sump threads from over‑tightening. It’s a small, cheap bit that does an outsized job.

As part of regular servicing on a 2019‑Toyota‑HiAce, it’s good practice to replace the sump‑plug‑washer at every engine oil change. The washer is designed to be crushed once, reusing it can lead to slow leaks, messy undertrays, and even a drip on the driveway. With a fresh washer in place, the drain plug should be tightened to the factory spec—39 N·m per Toyota’s service data—rather than “as tight as possible”. That gets the seal you want without risking a stripped thread or a cracked sump.

Owners and fleets who service in‑house should keep a small stash of genuine‑spec washers on hand. For ANZ HiAce models (H300, 2019 launch), the EPC typically calls up a 12 mm aluminium crush washer (Toyota 90430‑12031). Some engine/build codes and regions use a copper equivalent, if in doubt, check the VIN in the EPC or match the old washer’s size and style. Don’t stack washers, don’t use thread sealant, and always clean the plug and sump face before refitting.

• Replace the sump‑plug‑washer at every oil change.
• Clean mating surfaces and fit the washer the right way round (flat face to sump).
• Tighten the plug to 39 N·m—no more, no less.
• After the first heat cycle, have a quick look for any weep.

Referencing: Toyota HiAce H300 (2019–) Repair Manual, Lubrication section (oil drain plug with gasket, torque 39 N·m). Toyota Electronic Parts Catalogue (EPC) for 2019 HiAce ANZ applications listing gasket 90430‑12031 (12 mm aluminium crush washer), with copper alternatives noted for some markets/builds.

Popular questions

What size sump‑plug‑washer does a 2019 HiAce use?
Most 2019 HiAce models in Australia and New Zealand use a 12 mm aluminium crush washer on the engine oil drain plug (Toyota P/N 90430‑12031). Some market or engine variants may specify a copper washer of the same size. The sure way to confirm is to check the VIN in the Toyota EPC or compare to the washer removed during service.

How often should the sump‑plug‑washer be replaced on a 2019 HiAce?
Every oil change. These washers are single‑use by design. Replacing them each service helps maintain the correct sealing load at the factory torque of 39 N·m and prevents slow leaks that can mask more serious issues.

Can the old washer be reused if it looks fine?
It’s not recommended. Once crushed, the washer won’t reliably reseal. Reusing can lead to weeping, over‑tightening to “chase” a seal, and potential damage to the sump threads. A fresh, correct‑spec washer is cheap insurance.