Parts for your 2008 Subaru Tribeca-Sump plug washers

2008 Subaru Tribeca sump plug washers

Yes — the 2008 Subaru Tribeca uses a sump plug washer. Subaru’s factory service information for the 2008 Tribeca (H6 EZ36, Lubrication section) specifies refitting the engine oil drain plug with a new gasket/washer every time and tightening it to the stated torque. The owner’s manual for that model also notes replacing the drain plug gasket during an oil change. Those sources confirm the washer is a required, single‑use seal on the Tribeca’s alloy sump.

What does it do? The washer is a soft, crush‑type ring (usually aluminium) that deforms slightly as the plug is torqued, filling any microscopic gaps between the plug face and the sump. That controlled deformation is what gives a reliable, reusable‑sump, single‑use seal. Without it, you’re likely to see slow weeps, the need to overtighten the plug, or a damaged sump face. Genuine Subaru gaskets (commonly superseded part numbers such as 11126AA000 or 803916010) suit the Tribeca and are inexpensive compared with the headaches of leaks.

As part of routine servicing, the washer should be replaced at every oil and filter change. After the oil has drained, fit a new washer to the clean plug, wipe the sump face, and tighten to the specification printed in Subaru’s service data for the 2008 Tribeca with a torque wrench: 44 N·m (about 33 ft‑lb). That torque achieves the crush needed without stretching threads or distorting the sump. A torque wrench is worth its weight in gold here, “good‑and‑tight” by feel can easily mean either too loose (weeping) or too tight (stripped threads) on an alloy pan.

If the old washer looks flattened, grooved, or stuck to the sump, bin it and start fresh, double‑stacking old washers is a common cause of drips. Wipe the area and check for a clean, dry seal after the first drive. If there’s any hint of dampness, crack the plug and replace the washer again rather than cranking on more torque. Aftermarket washers can work fine, but go for the correct crush‑type for Subaru rather than generic fibre washers, and keep a stash on the shelf so you’re never tempted to reuse one.

What sump plug washer should a 2008 Subaru Tribeca use?

Use a genuine Subaru crush‑type washer specified for the Tribeca’s H6 sump. These are commonly sold under Subaru part numbers such as 11126AA000 or 803916010 (parts are often superseded). If buying aftermarket, match the Subaru crush‑type profile rather than a generic fibre washer for a proper seal.

If unsure, check by VIN at a Subaru parts counter to ensure the latest superseded part number is supplied.

How often should the sump plug washer be replaced?

Every oil change. Subaru’s service literature calls for a new drain plug gasket each time the plug is refitted. Reusing an old washer risks seepage that can mist the underside of the vehicle and make it harder to spot real leaks later.

It’s a cheap, preventative part — keep a couple on hand so you never have to reuse one.

What is the torque spec for the 2008 Tribeca sump plug?

44 N·m (about 33 ft‑lb), as per Subaru service data. That figure delivers the correct crush of the aluminium washer. Going tighter won’t “seal better”, it can deform the sump or damage threads, while too loose can allow weeping.