Parts for your 2023 Mazda 3-Sump plug washers

2023 Mazda 3 sump plug washers

Yes, the 2023 Mazda 3 (BP series, Skyactiv-G engines) uses a crush-type sump plug washer on the engine oil drain plug. Mazda’s BP Workshop Manual (Engine Oil Replacement) specifies replacing the drain plug washer at each oil change and tightening the plug to the stated torque, and the Mazda Electronic Parts Catalogue lists an M14 “Gasket, Plug” for the BP Mazda 3 (commonly referenced as 99564-1400). These technical sources confirm the sump plug washer is a fitted, service-relevant part on this model.

On the 2023 Mazda 3, the sump plug washer is a small, single-use sealing ring that sits under the drain plug to keep engine oil where it belongs. It crushes slightly as the plug is tightened, filling microscopic gaps between the plug and the alloy sump. That controlled crush is what creates a reliable, leak-free seal without needing messy sealants.

Because it’s designed to deform once, a fresh washer should go in every time the oil is changed. Reusing an old one risks weeping around the plug, oil spots on the driveway, or worse, a slow oil loss that could catch an owner out on a long run. Mazda’s workshop guidance calls for washer replacement at each service and torquing the drain plug correctly (commonly specified around 30–41 N·m, always follow the latest workshop spec for the exact engine/variant).

• Choose a quality M14 crush washer (Mazda genuine or equivalent copper/aluminium).
• Inspect the sump’s sealing face for nicks, clean with a lint-free rag under the bonnet.
• Never add PTFE tape or liquid sealant, the washer is the seal.
• Tighten with a torque wrench—over-tightening can strip threads, under-tightening can seep.
• If the plug or washer face looks gouged, replace the plug along with the washer.

It’s a small, low-cost item that prevents big headaches. Workshops usually include a new washer in a routine service, DIY owners should keep a couple on hand. If there’s any sign of dampness around the plug after a change, it’s worth rechecking torque or fitting a fresh washer straight away.

Technical references: Mazda BP Mazda 3 Workshop Manual (Engine Oil Replacement procedure), Mazda Electronic Parts Catalogue for BP Mazda 3 listing the M14 drain plug gasket.

Popular questions

What size sump plug washer does a 2023 Mazda 3 use?
It uses an M14 crush washer designed for the engine oil drain plug. Genuine Mazda washers or quality aftermarket equivalents in copper or aluminium are suitable, provided they match the M14 spec.

How tight should the sump plug be on a 2023 Mazda 3?
Mazda workshop guidance commonly shows a torque in the 30–41 N·m range for the drain plug, depending on engine/variant. Always follow the current workshop manual for the exact figure and use a torque wrench.

Do sump plug washers need replacing every service?
Yes. They are single-use crush washers. Replacing them at each oil change ensures a proper seal and helps prevent leaks.