Parts for your 2005 Toyota Ractis-Sump plug washers

2005 Toyota Ractis sump plug washers – what they do and when to replace them

Yes, the 2005 Toyota Ractis uses a sump plug washer (also called a drain plug gasket). Technical sources including the Toyota Electronic Parts Catalog for the NCP100/NCP105 Ractis with the 1NZ-FE and 2SZ-FE engines list a 12 mm drain plug gasket (Toyota Genuine Part: 90430-12031). Toyota workshop literature for these engines also specifies replacing the drain plug gasket at each engine oil change to ensure proper sealing.

On this Ractis, the sump plug washer is a small, crush-style aluminium gasket that sits under the engine oil drain plug. Its job is simple but critical: when the plug is tightened, the washer deforms slightly to create a reliable seal between the plug head and the sump, preventing oil drips and seepage. That soft-metal “crush” is why it’s considered a consumable item.

As part of routine servicing, it’s good practice to fit a new washer every time the oil is changed. Reusing an old, flattened washer can lead to weeping around the plug, oil spots under the car, and the temptation to over-tighten the plug to stop a leak—risking stripped threads in the alloy sump. A fresh washer allows the plug to be tightened to the correct torque without drama (use the torque specified in the workshop manual for the Ractis’ engine—Toyota M12 plugs are typically around 27 N·m).

For owners and workshops in Australia and New Zealand, genuine or high-quality aftermarket M12 crush washers are inexpensive and easy to source. Keeping a few on hand makes oil changes cleaner and simpler. If the plug itself is damaged, replace it along with the washer.

• Look for telltales: oil mist around the plug, fresh drips after a service, or a washer that’s visibly gouged or flattened.
• Always wipe the sump face clean before refitting the plug with a new washer.
• Tighten with a torque wrench rather than “by feel” to protect the sump threads.

Part details commonly referenced for the 2005 Ractis (NCP100/NCP105): Drain plug gasket 90430-12031 (12 mm aluminium). These references come from Toyota Genuine Parts cataloguing and workshop procedures for the 1NZ-FE/2SZ-FE engines used in the Ractis.

Popular questions

Does the 2005 Toyota Ractis need a sump plug washer?
Yes. Toyota parts catalogues for the NCP100/NCP105 Ractis specify a 12 mm crush washer (90430-12031) for the engine oil drain plug. It’s designed to be replaced at each oil change to maintain a proper seal.

How often should the sump plug washer be replaced on a Ractis?
Replace it at every engine oil change. The washer is a crush-type gasket, once compressed, it won’t seal as effectively a second time. Given the low cost, it’s cheap insurance against leaks.

What size washer fits the 2005 Ractis sump plug?
It uses an M12 drain plug with a matching 12 mm crush washer. Toyota’s common genuine part number is 90430-12031, widely used across small Toyota engines, including the 1NZ-FE in the Ractis.