Parts for your 2017 Toyota Prius-Sump plug washers

2017 Toyota Prius sump plug washers (sumpplugwashers)

Based on technical sources, the 2017 Toyota Prius does use a sump plug washer. Toyota’s official Repair Manual (Toyota TIS, Engine/Hybrid System – Oil and Oil Filter – Replacement for the 2ZR-FXE engine) specifies refitting the drain plug with a new gasket and torquing the plug to approximately 27 N·m. The Toyota Electronic Parts Catalogue lists the drain plug gasket for the 2016–2018 Prius (ZVW50 series) as an aluminium crush washer, typically part number 90430-12031. Independent technical references such as the Haynes Toyota Prius manual also note that the drain plug gasket should be renewed at each oil change.

For the 2017 Toyota Prius, the humble sump plug washer does an outsized job. Sitting between the steel drain plug and the alloy sump, this small aluminium crush ring deforms as the plug is torqued, creating a reliable seal that keeps engine oil where it belongs. Without a fresh gasket, the face-to-face contact can’t compensate for tiny imperfections, which can lead to weeping, drips on the driveway, or overtightening to “chase” a seal—risking stripped threads in the alloy pan.

During servicing, replacing the sumpplugwashers is cheap insurance. Toyota’s guidance is to use a new washer at every oil change. In Australia and New Zealand, most Priuses are serviced at 15,000 km or 12 months (check the local logbook), so it makes sense to keep a couple of genuine washers on hand. The commonly specified Toyota Genuine gasket is 90430-12031 for the M12 drain plug used on the 2ZR-FXE. Fit the washer to the plug, ensure the sump’s sealing face is clean and flat, and tighten the plug to about 27 N·m with a torque wrench. No sealant or thread tape is required—just the correctly torqued plug and a fresh crush washer.

Good workshop habits make the difference on a hybrid that may start and stop its engine frequently:

• Confirm the old washer isn’t stuck to the sump before installing the new one.
• Wipe the mating faces clean and inspect for nicks, replace the plug if its face is gouged.
• Use quality, correct-size aluminium or copper only, avoid fibre washers on alloy sumps.
• After the first heat cycle, have a quick look for any seepage and retorque only if needed.

Owners and workshops looking after a 2017toyotaprius can count on a fresh sump plug washer to keep servicing tidy, leak-free, and to spec—exactly as Toyota intended.

What size and part number is the 2017 Toyota Prius sump plug washer?

It’s an aluminium crush washer for an M12 drain plug, commonly Toyota Genuine part number 90430-12031. Dimensions are roughly 12 mm internal diameter with an outer diameter around 21–22 mm. It’s designed as a single-use gasket—fit a new one at each oil change.

What’s the correct torque for the sump plug on a 2017 Prius?

Toyota specifies about 27 N·m (20 ft·lbf) for the 2ZR-FXE engine’s drain plug when installed with a new washer. Clean threads, a fresh gasket, and a torque wrench are the keys to a proper seal without overtightening.

Can a copper washer be used instead of the OEM aluminium washer?

Yes, a quality copper crush washer of the correct M12 size can seal effectively, but genuine Toyota aluminium washers are recommended for consistency. If using copper, ensure the dimensions match, and don’t reuse it—new at every service is best practice.