Parts for your 2013 Toyota Vitz|yaris-Sump plug washers

2013 Toyota Vitz/Yaris sump plug washers: what they do and when to replace

According to Toyota service literature for the NSP/NCP13# platform and the Toyota Electronic Parts Catalogue, the 2013 Toyota Vitz/Yaris is fitted with a replaceable aluminium crush-type sump plug washer on its 12 mm engine oil drain plug (Toyota gasket part number 90430-12031). That means the sump plug washer is very much relevant to routine servicing on this model.

On this Vitz/Yaris, the sump plug washer’s job is simple but vital: it crushes slightly as the drain plug is tightened, creating a reliable seal between the plug and the alloy sump. That single-use crush action helps prevent annoying weeps, driveway drips, and dust-laden grime building up under the bonnet. Toyota’s service procedures call for replacing the washer whenever the plug is removed during an oil change, rather than reusing it.

Owners who service their vehicles across Australia and New Zealand will typically find the washer is a 12 mm ID aluminium crush gasket (commonly 90430-12031). Quality copper equivalents are also widely available, but the genuine-style aluminium piece matches Toyota’s specification and crush characteristics. It’s designed to be installed once, after it’s been flattened, it won’t spring back or seal as intended the next time.

Best practice at each oil change is straightforward: make sure the old washer isn’t stuck to the sump, fit a new washer to the clean drain plug, and tighten the plug to the specification in the Toyota repair manual for the specific engine variant (typically around 30–40 N·m for these small Toyota engines). Over-tightening can distort the washer and stress the sump threads, while under-tightening can allow a slow seep. A torque wrench and a clean mating surface make all the difference.

Signs that a washer didn’t get replaced or seated properly include a damp halo around the plug, the odd spot of oil on the driveway overnight, or residue collecting after a few hundred kilometres. If seen, the fix is usually as simple as draining a little oil into a clean pan, swapping in a fresh washer, and re-torquing correctly. Given how inexpensive these gaskets are, keeping a small pack on the shelf is a tidy idea for DIY servicing.

• Part type: aluminium crush washer, 12 mm ID (Toyota P/N 90430-12031)
• Replace: every oil change (single-use)
• Tightening: use a torque wrench, follow the engine-specific spec in Toyota’s service data

Popular questions about 2013 Toyota Vitz/Yaris sump plug washers

What size and part number is the 2013 Toyota Vitz/Yaris sump plug washer?

The 2013 Vitz/Yaris uses a 12 mm internal-diameter crush washer on the engine oil drain plug. The commonly specified Toyota gasket part number is 90430-12031, an aluminium single-use washer that suits the M12 drain plug used on these engines.

Aftermarket copper or aluminium equivalents with the same dimensions are fine, but the crush and thickness of the genuine-style washer tends to seal most consistently on the alloy sump.

How often should the sump plug washer be replaced, and can it be reused?

It’s intended to be replaced at every oil change. The washer crushes once to form the seal, reusing it increases the risk of weeping or leaks, especially in hot A/NZ conditions and longer kilometre intervals.

Given the low cost of the part versus the hassle of a leak, replacing it each service is smart maintenance.

What torque should the sump plug be tightened to on a 2013 Vitz/Yaris?

Follow the figure in the Toyota repair manual for the exact engine code fitted to the vehicle, as specs can vary slightly. For these small Toyota engines, workshops typically see a spec in the 30–40 N·m range when a new washer is used.

Always fit a fresh washer, ensure the mating surface is clean, and use a torque wrench rather than “by feel” with a long spanner.