Parts for your 2010 Toyota Mark x-Sump plug washers

2010 Toyota Mark X sump plug washer — fitted, important, and easy to service

Based on Toyota’s technical documentation, the 2010 Toyota Mark X (GRX130/GRX133, 4GR‑FSE and 2GR‑FSE engines) is fitted with a separate sump plug washer. The Toyota Electronic Parts Catalogue lists an aluminium crush-type oil drain plug gasket for this model (commonly referenced as 90430‑12031, 14 mm). Toyota’s Repair Manual for the lubrication section also specifies replacing the drain plug gasket whenever the engine oil is changed. So yes, a sump plug washer is used on the 2010 Mark X, and it’s considered a service item.

The washer’s job is simple but critical: it deforms slightly as the sump plug is torqued up, creating a reliable seal between the plug and the sump to keep oil where it should be. Because it’s a crush gasket, it’s designed to be single-use. Reusing an old, flattened washer can lead to weeping, drips on the driveway, or a plug that needs to be overtightened to seal—never ideal for the threads in an alloy sump.

When servicing a 2010 Mark X, the best practice is to fit a new genuine-equivalent 14 mm aluminium washer at every oil change. Clean the sump mating face and the plug head, spin the plug in by hand to avoid cross‑threading, then torque it correctly. Toyota’s repair literature for GRX130 specifies around 39 N·m (29 ft·lbf) for the drain plug—tight enough to crush the washer and seal, without stressing the sump. No sealants or tape are required when the correct washer is used.

Owners and workshops in Australia and New Zealand often keep a small stash of Toyota 14 mm crush washers on the shelf—handy, inexpensive, and they save a trip mid-service. If the removed washer looks gouged, hardened, or stuck to the sump face, that’s a sign it’s overdue for replacement. Most Toyota aluminium washers are flat and symmetrical, so orientation isn’t critical, just ensure the faces are clean and the washer isn’t doubled up by accident.

• Replace the sump plug washer at every oil change or any time the plug is removed.
• Watch for tell‑tales like a small oil ring around the plug or fresh drips after a service.
• Use a torque wrench to 39 N·m and avoid reusing old washers.

What size sump plug washer does the 2010 Toyota Mark X use?

It uses a 14 mm aluminium crush washer commonly catalogued by Toyota as 90430‑12031 (some markets list 90430‑12028). Always confirm by VIN or engine code if unsure, as regional listings can vary slightly.

Do you really need to replace the washer every service?

Yes. It’s a single‑use crush gasket designed to deform once for a perfect seal. Toyota service information calls for replacement at each oil change to prevent seepage, avoid over‑tightening, and protect sump threads.

What’s the correct torque for the sump plug on a 2010 Mark X?

Approximately 39 N·m (29 ft·lbf) per Toyota repair manual guidance for GRX130. Fit a new washer, snug the plug by hand first, then torque to spec—no sealant required when the right washer is used.