Parts for your 2010 Subaru Tribeca-Sump plug washers

2010 Subaru Tribeca sump plug washers

Yes, the 2010 Subaru Tribeca uses a sump plug washer. Subaru’s factory service information and the OEM parts catalogue for the EZ36 3.6‑litre engine specify an aluminium crush washer on the engine oil drain plug, intended to be replaced whenever the plug is removed. In parts listings this gasket commonly appears as a 16 mm aluminium drain plug washer (often referenced under Subaru PN 803916010). These technical sources make it clear the washer is not optional, it’s the sealing element that prevents oil seepage at the sump plug.

On a Tribeca, the sump plug washer does the quiet but critical job of sealing the drain plug against the alloy sump. Being a soft, single‑use aluminium ring, it deforms slightly as the plug is tightened to the factory torque, creating a gas‑ and oil‑tight seal without needing excessive muscle on the spanner. That controlled crush is what saves the sump threads and keeps the driveway free of drips.

As part of regular servicing in Australia and New Zealand conditions, it’s smart to fit a new OEM‑spec washer at every oil change. Reusing a flattened washer can lead to weeping around the plug, or tempt overtightening to “chase” a seal—both of which can damage the sump. If a previous service skipped it, signs include a faint oil halo around the plug, a slight smell of hot oil after a run, or the need to tweak the plug tighter to stop a slow seep.

For best results, they’ll clean the mating face on the sump, fit a fresh washer, and tighten the plug to the published Subaru torque spec for the EZ36 (not “as tight as possible”). Aluminium washers match the sump’s thermal expansion and crush characteristics, while copper or fibre alternatives exist, sticking with the Subaru‑specified aluminium style avoids guesswork. Keeping a couple of genuine washers on the shelf means no delays when the next oil change rolls around.

Quick service tips owners appreciate:

• Replace the washer every oil change, don’t reuse crushed ones.
• Inspect for nicks or burrs on the sump’s sealing face before refitting.
• Tighten the plug to the correct torque—nip‑up plus “feel” isn’t a spec.
• If a leak persists with a new washer, check for a scored sump face or a damaged plug.

Popular questions about 2010 Subaru Tribeca sump plug washers

Does the 2010 Tribeca need a sump plug washer, and what type?

It does. Subaru specifies a single‑use aluminium crush washer for the oil drain plug on the EZ36 engine. The commonly listed OEM style is a 16 mm aluminium washer (often catalogued under Subaru PN 803916010). Using the correct aluminium type ensures proper crush and a reliable seal.

How often should the sump plug washer be replaced?

Every time the drain plug is removed—so, at each oil change. The washer is designed to deform once. Reusing it risks weeping, strip‑happy overtightening, and avoidable mess under the Tribeca.

Can a copper washer be used instead?

Copper can seal, but Subaru’s service guidance and parts catalogues specify aluminium for this application. Aluminium crush washers match the sump and plug design and minimise the torque needed to achieve a proper seal. If copper is used in a pinch, confirm sizing and sealing, then replace with the correct aluminium washer at the next service.