Parts for your 2014 Subaru Legacy-Sump plug washers

2014 Subaru Legacy (Liberty) sump plug washers

Technical sources for the 2014 Subaru Legacy (Liberty in AU/NZ) confirm that a sump plug washer is used and required whenever the engine oil is drained. The 2014 Subaru Service Manual (Engine Lubrication section) instructs replacing the oil drain plug gasket at each removal, and Subaru’s parts catalogue lists an aluminium crush washer for the engine oil drain plug (commonly P/N 803916010, 16 mm). The Owner’s Manual maintenance notes also reference replacing the drain plug gasket during oil changes. So, yes—this model is designed to run a sump plug washer, and it’s not optional.

What’s the washer actually doing? It’s a soft, single-use aluminium ring that crushes slightly as the plug is tightened, creating a reliable seal between the plug head and the sump. That prevents annoying oil weeps, helps the plug reach the correct clamp load at the specified torque, and protects the alloy sump face from damage. It’s a small part doing an important job on every 2.5i and 3.6R variant of the 2014 Legacy/Liberty.

For servicing, replacing the washer at every engine oil change is the smart move. Reusing a crushed washer can lead to seepage, drips on the driveway, or the temptation to over-tighten the plug—none of which is ideal. Stick with a quality OEM-style aluminium crush washer sized for Subaru’s M16 drain plug (16 mm ID). The drain plug torque for this model is approximately 44 N·m (32.5 ft‑lb), start the plug by hand, snug it evenly, then torque to spec. No sealant or tape is needed—if the surfaces are clean and the washer is new, it’ll seal as intended.

Orientation worries? The Subaru washer is effectively symmetrical, so it can go either way. Avoid stacking washers to “fix” a mark on the sump, instead, lightly dress the mating face if needed or replace damaged parts. Always clean the plug and sump face, bin the old washer, and check for any signs of weeping after the first short drive post-service.

• Use the correct 16 mm aluminium crush washer (e.g., Subaru P/N 803916010).
• Replace at every oil change—simple, cheap, and leak-free.
• Tighten the plug to about 44 N·m, don’t overdo it.

What size sump plug washer does a 2014 Subaru Legacy use?

It uses a 16 mm internal diameter aluminium crush washer that suits Subaru’s M16 drain plug. An OEM-equivalent part often cited in Subaru catalogues is P/N 803916010, used across both 2.5i and 3.6R engines.

How often should the sump plug washer be replaced?

Best practice is every oil change. The washer is designed to crush once, so reusing it risks weeping or needing extra torque on the plug to get a seal.

What is the correct torque for the drain plug on the 2014 Legacy?

About 44 N·m (32.5 ft‑lb). Start the plug by hand to avoid cross-threading, torque it once seated, and don’t add sealants—if the washer and faces are clean, it’ll seal properly.