Parts for your 2012 Toyota Prius-Sump plug washers

2012 Toyota Prius sump plug washers

Yes, the 2012 Toyota Prius uses a sump plug washer (engine oil drain plug gasket). Toyota’s Repair Manual for the 2ZR-FXE engine in the ZVW30 Prius specifies refitting the drain plug with a new gasket and tightening to 27 N·m. The Toyota Electronic Parts Catalogue lists the correct gasket as an aluminium crush washer, part number 90430-12031. General workshop guides such as the Haynes Prius manual also call for replacing the drain plug washer at each oil change.

On this Prius, the sump plug washer is a small, single-use aluminium crush gasket that sits under the drain plug head. Its job is simple but critical: it deforms as the plug is tightened, filling microscopic gaps between the steel plug and the alloy sump to create a reliable, leak-free seal. That soft metal “crush” saves the sump threads from abuse, helps the plug reach the right clamping force at the specified torque, and keeps the driveway free of drips.

As part of regular servicing, the washer should be replaced at every engine oil change. It’s inexpensive, and skipping it can lead to weeping around the plug or the temptation to overtighten—neither of which is good for an aluminium sump. The correct Toyota washer for the 2012 Prius is 90430-12031 (12 mm aluminium crush type). Aftermarket equivalents are fine so long as they match the size and material.

When fitting, clean the sump’s sealing face and the plug head, slip on a new washer, and tighten the plug to 27 N·m with a torque wrench. No sealant, no tape—just a clean surface and the proper crush washer. After the first heat cycle, a quick look underneath for any hint of seepage is smart practice.

Tell-tales that the washer needs changing include a visible groove crushed into the old gasket, oil misting near the plug, or a plug that feels like it needs “a bit more oomph” to stop a weep. That’s a sign it’s been reused. Copper or fibre washers can work in a pinch, but Toyota specifies aluminium for this application and that’s the safest bet for consistent sealing on the Prius’ alloy sump.

• Use a new 90430-12031 washer at every oil change.
• Tighten the drain plug to 27 N·m—no more, no less.
• Confirm fitment by VIN if unsure, 2ZR-FXE engines use a 12 mm aluminium crush washer.

What sump plug washer does a 2012 Toyota Prius use?

It uses a 12 mm aluminium crush washer, Toyota part number 90430-12031. It’s designed to be replaced at every oil change to ensure a proper seal on the alloy sump.

Do you really need to replace the washer every service?

Yes. The washer is single-use, once crushed, it won’t seal the same way again. Reusing it risks weeping and can tempt overtightening, which isn’t great for sump threads.

What’s the correct torque for the sump plug on a 2012 Prius?

27 N·m. That figure is specified in Toyota’s Repair Manual for the ZVW30 Prius with the 2ZR-FXE engine, and assumes a clean seat and a new crush washer.