Parts for your 2008 Toyota Vitz|yaris-Sump plug washers

2008 Toyota Vitz/Yaris sump plug washers

Yes, the 2008 Toyota Vitz/Yaris uses a sump plug washer. Technical references: Toyota’s Repair Manual for the XP90 series (2005–2010) calls for a “new gasket” when installing the engine oil drain plug and specifies tightening torque around 27 N·m (20 ft·lbf). Toyota’s Electronic Parts Catalog for NCP90/NCP91 models lists the oil drain plug gasket as an aluminium crush washer, commonly part number 90430-12031.

On the 2008 Vitz/Yaris, the sump plug washer is a small but critical seal that sits between the drain plug and the sump. It’s designed to crush slightly when torqued, conforming to the mating surfaces and preventing any weeping after an oil change. Because it’s a crush-type seal, it’s considered single-use—reusing it can lead to slow drips, annoying spots on the driveway, or the temptation to overtighten the plug which risks stripping threads in the alloy sump.

Best practice on these Toyotas is to fit a new washer at every oil change. It’s inexpensive insurance, and exactly what Toyota specifies. During servicing, clean the sump face, make sure the old washer isn’t stuck on the pan, fit the new aluminium washer to the plug, start the plug by hand to avoid cross-threading, then torque it to about 27 N·m. No sealant or tape is needed, and shouldn’t be used.

The washer size is for an M12 drain plug, and genuine Toyota part 90430-12031 is ideal, though quality aftermarket aluminium or copper crush washers with the correct dimensions also do the job. Under normal Aussie and Kiwi service intervals—typically 10,000–15,000 km or 12 months—replacing the washer each time keeps everything tidy and leak-free.

• Signs it needs attention: fresh oil mist around the plug, a drip after a change, or a washer that’s visibly grooved or flattened.
• Handy tip: keep a couple of spare washers in the glovebox so you’re sorted on service day.
• If a previous tech used RTV or a fibre washer, clean the surfaces thoroughly and return to the correct crush washer setup.

Stick with a proper crush washer, the right torque, and the Vitz/Yaris will stay bone dry under the sump—too easy.

What size washer and part number does the 2008 Vitz/Yaris use?

It uses a 12 mm aluminium crush washer on an M12 drain plug. The commonly specified Toyota part number is 90430-12031. A quality aftermarket washer of the same size will also work if it matches the dimensions.

How often should the sump plug washer be replaced, and what torque should be used?

Replace the washer at every oil change. Toyota’s repair manual for the XP90 Yaris/Vitz specifies tightening the drain plug to about 27 N·m (20 ft·lbf). Always start the plug by hand before torquing to avoid cross-threading.

Can the old washer be reused?

It’s not recommended. The washer is a crush type and is designed for single use. Reusing it can cause slow leaks or make you crank the plug tighter than you should, which risks damage to the sump threads.