Parts for your 2016 Toyota Avensis-Sump plug washers

2016 Toyota Avensis sump plug washers — what they do and when to replace them

Yes, the 2016 Toyota Avensis uses a sump plug washer (also called a drain plug gasket/crush washer). Technical sources including the Toyota Genuine Parts electronic catalogue and the Toyota Avensis T27 repair manual specify a replaceable crush-type washer for the engine oil drain plug, and workshop references such as Haynes and Autodata list the washer as a single‑use item to be renewed at each oil change. Common Toyota part listings show an aluminium crush washer (often referenced as 90430‑12031 for many petrol variants), with diesel variants sometimes using a different size, the correct washer is engine‑dependent and should be confirmed against the VIN in the Toyota EPC.

On this Avensis, the sump plug washer is a small but critical seal that sits between the drain plug head and the sump. When the plug is tightened, the soft metal washer deforms slightly to create a fluid‑tight seal. That deformation is what keeps engine oil where it belongs and helps prevent annoying weeps, drips on the driveway, and low‑oil warnings between services.

Because it’s a crush washer, it’s designed for one use only. Re‑using it can seem fine in the moment, but once it’s been compressed it won’t crush evenly a second time, which can lead to seepage or the temptation to overtighten the plug. Toyota’s service guidance calls for replacing the drain plug gasket at every engine oil change. It’s a low‑cost part that protects a far more expensive engine.

Owners having their 2016 Toyota Avensis serviced should make sure the new washer matches the engine variant. Many petrol Avensis models use a 12 mm aluminium washer, while some diesels use a different size or material. Genuine Toyota or high‑quality aftermarket washers are both acceptable, provided the inner diameter, outer diameter and thickness match the spec. If the washer design is stepped or tapered, it should be fitted the right way around as per the workshop manual. Always clean the mating face on the sump, start the plug by hand to avoid cross‑threading, and tighten to the torque specified in the factory manual for the exact engine.

• Replace the washer at every oil change (time/kilometres per the maintenance schedule).
• Don’t stack washers or use sealants/PTFE tape—use the correct single washer.
• After the service, check for any signs of weeping over the next few trips.

Done right, a fresh sump plug washer keeps the Avensis leak‑free and the engine properly protected between services.

Does the 2016 Toyota Avensis definitely have a sump plug washer?

Yes. Toyota’s Avensis T27 repair procedures and parts listings specify a replaceable crush washer for the engine oil drain plug across the 2016 range. It’s considered a single‑use service item and should be renewed with each oil change.

How often should the sump plug washer be replaced on a 2016 Avensis?

Every oil change. Whether the service interval is time‑based or kilometre‑based, Toyota workshop guidance and common industry references (Haynes/Autodata) call for fitting a new washer whenever the drain plug is removed.

What size or type of washer does it take?

Many petrol engines in the 2016 Avensis use a 12 mm aluminium crush washer commonly listed by Toyota, while some diesel variants use a different size. The safest bet is to confirm the exact washer by VIN in the Toyota parts catalogue or match the washer to the existing plug’s thread size and head seat.