Parts for your 2021 Subaru Xv-Sump plug washers

2021 Subaru XV sump plug washers

Yes, a sump plug washer is fitted to the 2021 Subaru XV. Subaru’s own technical literature specifies it: the 2021 XV (G5X) FB20/FB20D engine oil change procedure in the Subaru Workshop Manual instructs replacing the drain plug gasket whenever the plug is removed, and the Subaru Genuine Parts Catalogue lists a drain plug gasket for the oil pan on this model (commonly noted as 803916010, 16 mm aluminium crush type). The owner’s manual oil-change guidance also calls for installing a new gasket at refit. That’s the signal that this small part is essential on the XV.

What does the washer actually do? It’s a single-use aluminium “crush” washer that deforms slightly as the sump plug is tightened, creating a reliable seal between the plug and the oil pan. That crush action evens out tiny imperfections in the mating surfaces, stopping weeps and drips that can otherwise stain the driveway or, worse, lead to a low-oil situation. On the XV’s FB-series boxer engines—petrol and e-Boxer hybrid alike—the washer helps the plug clamp at the correct load without needing to over-tighten.

Best practice is simple: replace the sump plug washer at every oil change. It’s inexpensive, it protects the threads and sealing face, and it keeps the plug torque consistent with what the workshop manual specifies. A genuine Subaru aluminium washer (commonly the 16 mm gasket) or a quality equivalent that matches the OE thickness and hardness is the go. If in doubt, check the VIN in a parts system or the lubrication section of the service manual for confirmation.

• Never reuse a crushed washer—once it’s flattened, it won’t seal the same.
• Clean the plug and pan sealing faces before refitting, replace a marked or gouged plug.
• Tighten the plug to the specification in the Subaru manual—don’t “swing off” it with a long bar.
• After the first drive, have a quick squiz underneath to make sure there’s no fresh oil around the plug.
• Keep a couple of spare washers on hand so every service is a straight swap.

Follow those steps and the XV’s sump stays tidy, the oil stays where it should, and servicing stays drama-free—very Kiwi and Aussie sensible.

FAQs

What size sump plug washer does a 2021 Subaru XV use?
Most 2021 XV models use a 16 mm aluminium crush washer on the engine oil drain plug, commonly referenced in Subaru parts as gasket 803916010. Always confirm against the vehicle’s VIN or workshop manual to be safe.

How often should the sump plug washer be replaced on a 2021 Subaru XV?
Every oil change. Subaru’s service documentation specifies fitting a new gasket whenever the plug is removed, so it’s treated as a single-use item during routine servicing.

Can the washer be reused if it looks fine?
It’s not recommended. The washer is designed to deform once to make a proper seal. Reusing it can lead to slow weeps or the need to over-tighten the plug, which risks damaging threads or the pan sealing face.