Parts for your 2022 Subaru Impreza-Sump plug washers

2022 Subaru Impreza sump plug washers — what they do and when to replace them

Yes, the 2022 Subaru Impreza uses a sump plug washer. Subaru’s own technical materials call for a replaceable crush washer on the engine oil drain (sump) plug for the FB20-powered Impreza. The 2022 Impreza Owner’s Manual (Maintenance and service – Engine oil) instructs replacing the gasket when refitting the plug, and Subaru service documentation and parts catalogues list a 16 mm aluminium drain plug gasket (commonly supplied as Subaru genuine p/n 803916010, with earlier supersessions such as 11126AA000 appearing in some catalogues). Those sources make it clear the sump plug washer is a standard, service-replaceable item on this model.

On the 2022 Subaru Impreza, the sump plug washer is a small, single-use aluminium “crush” gasket that sits between the sump plug head and the oil pan. When the plug is tightened to factory torque, the washer deforms slightly to create a reliable, fluid-tight seal. That crush action is what keeps engine oil from weeping past the threads or the plug face under heat and vibration.

Because it’s designed to deform once, it shouldn’t be reused. Reusing a flattened washer often leads to slow leaks, oily undertrays, and the temptation to overtighten the plug to stop a drip—risking stripped threads in the alloy pan. During a routine service or DIY oil change, it’s best practice to fit a fresh washer every time.

Simple tips for looking after the sump plug and washer on a 2022 Impreza:

• Always use a new, correct-size 16 mm aluminium crush washer that matches Subaru specs (genuine or high-quality equivalent).
• Clean the mating surfaces on the plug and pan before refitting.
• Tighten the sump plug with a torque wrench to the factory spec (around 30 N·m). Check the service manual for the exact figure for your market.
• After the oil change, run the engine, then inspect around the plug for any seepage and recheck the level.

Genuine-style sump plug washers are inexpensive and are often sold in multi-packs—handy if servicing at home. For anyone chasing tidy, drama-free servicing, replacing the sump plug washer at each oil change is one of those tiny steps that pays off with a clean driveway and a happy Impreza.

Popular questions about 2022 Subaru Impreza sump plug washers

Does the 2022 Subaru Impreza have a sump plug washer, and what size is it?
It does. The engine oil sump plug uses a single-use aluminium crush washer, commonly 16 mm ID as specified in Subaru parts catalogues for FB-series engines. Subaru genuine options include p/n 803916010 (with superseded numbers appearing in some lists).

How often should the sump plug washer be replaced?
Every oil change. Subaru’s owner literature directs replacing the gasket whenever the plug is removed. It’s cheap insurance against weeping seals and avoids the need to overtighten the plug.

What happens if the washer is reused?
A reused crush washer may not seal properly, leading to a slow leak. Owners sometimes compensate by cranking the plug tighter, which can damage the oil pan threads. A fresh washer and correct torque are the right fix.