Parts for your 2022 Mazda 3-Sump plug washers

2022 Mazda 3 sump plug washers

Technical sources confirm that the 2022 Mazda 3 (BP series, Skyactiv-G/D engines) uses a sump plug washer. The Mazda3 BP Workshop Manual procedure for Engine Oil Replacement specifies refitting the drain plug with a new washer. Mazda’s Electronic Parts Catalogue for the BP chassis lists a 14 mm aluminium oil drain plug gasket (commonly catalogued as a Mazda Genuine part). Dealer service procedures also note replacement of the drain plug washer at each engine oil change. On that basis, a sump plug washer is relevant and fitted on the 2022 Mazda 3.

On a 2022 Mazda 3, the sump plug washer’s job is simple but crucial: it seals the drain plug to the alloy sump so engine oil doesn’t seep out once the plug is tightened. Mazda uses an aluminium crush washer that deforms slightly under torque, filling microscopic gaps between the plug head and the sump face. That controlled “crush” is what delivers a reliable, leak-free seal without over-tightening the plug.

For servicing, it’s best practice to replace the washer at every oil change. Because the washer is designed to deform once, reusing it can lead to weeping around the plug, messy drips on the driveway, and the temptation to over-tighten to chase a seal—never ideal on an alloy sump. A fresh, correct-size aluminium washer is inexpensive insurance.

When the Mazda 3 is in for an oil and filter change, a competent technician will:

• Remove the old washer and inspect the drain plug threads and head for wear or scoring.
• Clean the sump’s sealing face so the new washer sits flat.
• Fit a new OEM-equivalent 14 mm aluminium crush washer and tighten the plug to the factory torque spec from the workshop manual.
• Refill with the correct oil grade, run the engine, and check for any seepage.

Owners who DIY should keep a couple of spare washers on hand and avoid copper or fibre substitutes unless they explicitly meet Mazda’s spec. If the plug shows damage or its magnetic tip is loose (where fitted), replace the plug as well. After the change, a quick look under the car over the next day or two is a good habit—no fresh oil marks around the plug means the new washer is doing its job. It’s a small part, but it keeps the Mazda 3 tidy, leak-free, and happy between services.

Q: What size sump plug washer does a 2022 Mazda 3 use?

It uses a 14 mm aluminium crush washer. Mazda Genuine parts catalogues this as a 14 mm oil drain plug gasket, and quality aftermarket 14 mm aluminium washers designed for Mazda applications will also do the trick.

Q: How often should the sump plug washer be replaced on a 2022 Mazda 3?

Replace it at every engine oil change. The washer is a single-use crush design, so fitting a fresh one each service helps ensure a proper seal without overtightening.

Q: Can the old washer be reused if it looks OK?

Not recommended. Once crushed, it won’t seal as intended a second time. Reusing can cause slow weeping or require extra torque on the plug, which isn’t great for the sump threads.