Parts for your 2019 Toyota Mark x-Sump plug washers

2019 Toyota Mark X sump plug washers

For the 2019 Toyota Mark X (GRX130 series, 4GR-FSE/2GR-FSE V6), a sump plug washer—also called the engine oil drain plug gasket—is fitted and required. Toyota’s Repair Manual procedures for the GRX130 platform specify installing a new drain plug gasket whenever the engine oil is changed and tightening the drain plug to the specified torque, confirming the washer’s use and single‑use nature. The Toyota Electronic Parts Catalogue for GRX130 also lists a dedicated drain plug gasket (commonly 90430-12031, 12 mm aluminium crush washer) for the oil pan drain plug.

Technical sources: Toyota Repair Manual (GRX130 Series, 2016–2019), Engine – Lubrication – Engine Oil, drain and refill procedure (notes: “Install a new gasket to the drain plug, tighten to spec”), Toyota Electronic Parts Catalogue (GRX130 Mark X) listing “Gasket, drain plug” for the engine oil pan.

What’s the point of the washer? It’s a soft, crushable seal that deforms once to match the sump’s sealing face and the plug’s flange. That one-time crush prevents weeping, keeps the torque accurate, and protects the alloy sump from over-tightening dramas. On the Mark X, the drain plug is an M12 type and the aluminium washer provides the correct clamping load at the Toyota torque spec—typically 39 N·m—without needing to overtighten.

As part of regular servicing, the washer should be replaced at every oil change. Reusing a crushed washer can lead to small leaks, drips on the driveway, or worse—chasing a “leak” by over-torquing and risking thread damage. Genuine Toyota washers (e.g., 90430-12031) or high-quality aftermarket equivalents are fine, just match the size (12 mm ID) and material (aluminium or copper crush type). Avoid sealants, tape, or doubling up washers—none of that is needed when the correct part is fitted once and torqued properly.

• Replace the washer every service (typically 10,000 km/12 months, or as per your local schedule).
• Clean the sump face and the plug flange, fit a new crush washer.
• Tighten the plug to about 39 N·m, don’t “gorilla” it—let the washer do the sealing.
• After the first warm-up, have a quick look under the car for any signs of weeping.

Done this way, the 2019 Mark X stays dry around the sump, the plug comes out easily next time, and the alloy threads remain happy for the long haul—too easy.

FAQs

What size sump plug washer does a 2019 Mark X use?
It uses a 12 mm crush washer for the M12 drain plug, commonly Toyota part number 90430-12031 (aluminium). Always confirm by VIN if unsure, as regional parts listings can vary slightly.

How often should the sump plug washer be replaced?
Every oil change. It’s designed to crush once and seal, reusing it increases the chance of minor leaks and can throw off proper torque.

What torque should the sump plug be tightened to?
Around 39 N·m for the GRX130’s V6 engines. That spec relies on a new crush washer—don’t exceed it, as overtightening can damage the sump threads.