Parts for your 2007 Toyota Highlander-Sump plug washers

2007 Toyota Highlander (Kluger): Are sump-plug-washers used?

Yes, the 2007 Toyota Highlander (sold as Kluger in AU/NZ) is designed to use a sump-plug-washer on the engine oil drain plug. Toyota’s service literature (TIS repair manuals for the 2GR‑FE and 3MZ‑FE engines) calls for replacing the oil drain plug gasket at each engine oil change, and specifies the drain plug torque at roughly 39 N·m (29 ft·lbf). Toyota’s Electronic Parts Catalogue (EPC) lists the applicable oil drain plug gasket as a 12 mm aluminium crush washer, commonly supplied as part number 90430‑12031. Those sources confirm that a sump-plug-washer is fitted and expected to be renewed during routine servicing.

The sump-plug-washer on a 2007 Highlander/Kluger does a deceptively important job. It’s a soft, single-use crush gasket that sits between the drain plug head and the sump. When the plug is tightened, the aluminium washer deforms slightly to fill tiny imperfections in the mating surfaces, creating a leak-free seal that stands up to heat cycles and vibrations. Without that crush action, even a correctly tightened plug can weep oil, leaving tell-tale drips on the drive and a faint oily haze under the car.

For this model, Toyota specifies replacing the washer every time the engine oil is changed. Reusing an old one can look tempting, but once it’s crushed, it won’t reliably reseal. That’s why keeping a few spares on hand is a smart move. Use the correct 12 mm Toyota-style washer (such as 90430‑12031) or a quality equivalent to match the plug and sump seat.

Good practice is simple: warm the engine, drain the oil, remove the old washer (they sometimes stick to the sump—peel it off if needed), wipe the sealing surfaces clean, fit a fresh washer to the plug, and reinstall the plug to the proper torque—about 39 N·m (29 ft·lbf). Avoid overtightening, alloy sumps don’t appreciate gorilla force and you risk damaging threads. There’s no need for sealants or tape, the crush washer is the seal. If the plug or sump seat looks nicked or scored, replace the plug and inspect the sump face so the new washer can do its job properly.

Aluminium is the standard call here, though quality copper crush washers can work if they’re the correct size and design. Magnetic drain plugs are fine too, but they still need that washer. Stick with the right part, replace it at every service, and the Highlander/Kluger will stay tidy and drip-free between oil changes.

• Typical washer: 12 mm aluminium crush type (e.g., Toyota 90430‑12031)
• Drain plug torque: ~39 N·m (29 ft·lbf)

Popular questions about 2007 Toyota Highlander sump-plug-washers

What size sump-plug-washer does the 2007 Highlander/Kluger use?
The Highlander/Kluger of this year typically uses a 12 mm aluminium crush washer that matches the factory drain plug and sump seat. In Toyota parts catalogues, it’s commonly listed as 90430‑12031. Using the correct size and style ensures the washer crushes properly and seals without needing sealant.

How often should the sump-plug-washer be replaced?
Every oil change. Toyota service guidance treats the washer as a single-use gasket. Replacing it each time prevents slow weeps and avoids having to overtighten the drain plug to chase a seal—something that can damage the sump threads.

What’s the correct torque for the drain plug with a new washer?
Around 39 N·m (29 ft·lbf). That setting, with a fresh crush washer, delivers a dependable seal without stressing the sump. Always clean the mating surfaces and confirm the old washer isn’t stuck to the sump before tightening.