Parts for your 2015 Subaru Xv-Sump plug washers

2015 Subaru XV sump plug washer — what it does and when to replace it

Based on Subaru technical information, the 2015 Subaru XV (FB20 engine, GP series) does use a sump plug washer. The Subaru Factory Service Manual’s Engine Lubrication section specifies fitting a new drain plug gasket whenever the engine oil is changed, and the Subaru FAST electronic parts catalogue lists the aluminium crush washer (oil drain plug gasket) under part number 11126AA000 for this model. The same factory material gives the typical drain plug tightening torque at around 44 N·m. So yes — a sump plug washer is absolutely relevant and fitted on the 2015 XV.

On this XV, the sump plug washer’s job is simple but critical: it crushes slightly as the drain plug is tightened, creating a tight seal between the plug and the alloy sump. That soft aluminium gasket takes up tiny imperfections so the engine oil doesn’t drip onto the driveway or, worse, mist back under the car while driving.

Because it’s a crush washer, it’s designed for one-time use. Once compressed, it won’t spring back or seal the same way again. Reusing it can lead to weeping oil, a hot-oil smell after a run, or a small drip that gets messy pretty quickly. Subaru’s own service information tells technicians to replace the gasket at each oil change, and that’s exactly what a good workshop will do when servicing a 2015 XV.

For owners who DIY, it’s worth keeping a couple of genuine or high-quality equivalent aluminium washers on hand. Clean the sump face and plug, slip on a fresh washer, and tighten the plug to spec — don’t just “send it” with extra grunt. Overtightening can distort the washer or even damage the sump threads, while undertightening can allow a slow leak. If there’s any doubt after the service, a quick look under the car over the next few drives will confirm all’s well.

Alongside regular oil and filter changes, sticking to a new sump plug washer each time is cheap insurance for a tidy, leak-free FB20. It keeps the underbody clean, avoids that annoying drip on the garage floor, and helps ensure the XV’s engine oil stays where it should — inside the engine.

• Part: Aluminium crush washer (oil drain plug gasket), commonly Subaru p/n 11126AA000
• Replace: Every oil change/service
• Tightening torque: Approximately 44 N·m (always use current Subaru spec)
• Watch for: Oil weep around the plug, burnt oil smell, fresh spots on the driveway

Popular questions

Does the 2015 Subaru XV need a new sump plug washer at every oil change?
Yes. Subaru’s factory service guidance calls for replacing the drain plug gasket each time the engine oil is changed. The aluminium washer deforms to seal, once crushed, it shouldn’t be reused if a proper seal is expected.

What’s the recommended torque for the 2015 XV sump plug?
Around 44 N·m is the typical specification for the FB20 engine’s drain plug. Using a torque wrench helps avoid under- or over-tightening, both of which can cause leaks or damage. Always follow the latest Subaru service data if available.

Is OEM best for the XV’s sump plug washer, or will an aftermarket one do?
An OEM aluminium crush washer (commonly p/n 11126AA000) is a safe bet. Quality aftermarket aluminium equivalents also work well if they match the correct size and profile. Avoid reusing any washer, regardless of brand.