Parts for your 2002 Subaru Forester-Sump plug washers

2002 Subaru Forester sump plug washers

Based on technical sources, the 2002 Subaru Forester does use a sump plug washer (also called a drain plug gasket). The Subaru Forester 2002 Service Manual, Engine Lubrication section, specifies refitting the drain plug with a new gasket and tightening to 44 N·m (about 32 ft·lb). Subaru’s genuine parts catalog also lists an aluminium crush gasket for the Forester of this era, commonly noted as gasket, drain plug, 16 mm, part number 803916010. The 2002 Forester Owner’s Manual reiterates replacing the gasket at each oil change. These sources confirm the washer is fitted and required.

On a 2002 Forester, the sump plug washer is a simple, single-use crush ring that seals the oil drain plug to the alloy sump. When the plug is tightened to spec, the soft aluminium washer deforms slightly, filling tiny gaps so engine oil can’t seep past. It’s a cheap consumable that quietly does an important job—keeping the driveway clean and the engine topped with the oil it should have.

Because it’s designed to crush once, it’s best practice to replace the washer every oil change. Reusing an old washer can lead to slow weeps, drips after a hot run, or the temptation to overtighten the plug to “stop a leak”, which risks damaging threads in the sump. For the EJ25-powered 2002 Forester, use the correct 16 mm aluminium crush type and torque the plug to around 44 N·m. No need to lean on it—let the washer do the sealing.

As part of regular servicing of a 2002 Subaru Forester sump plug washer, a few friendly pointers help avoid dramas:

• Always have a fresh washer on hand before dropping the oil.
• Wipe the sump’s sealing face and the plug head clean, grit can cause weeps.
• Inspect the plug threads and magnet (if fitted) for damage or heavy metal fuzz.
• Hand-start the plug to avoid cross-threading, then torque to spec.
• After the first drive, pop back under and check for any sign of a film of oil.

For owners chasing reliability without fuss, swapping the washer at each service is an easy, low-cost win. It keeps the Forester tidy, protects the sump threads, and means the oil stays where it belongs, even on long Kiwi or Aussie road trips.

Technical sources referenced: Subaru Forester 2002 Service Manual (Engine Lubrication), Subaru Genuine Parts Catalogue listing for drain plug gasket 16 mm (PN 803916010), 2002 Subaru Forester Owner’s Manual oil change procedure.

Does a 2002 Subaru Forester need a new sump plug washer at every oil change?
Yes. Subaru’s factory guidance calls for replacing the drain plug gasket each time the oil is changed. The crush washer is single-use, reusing it can lead to slow leaks and the risk of overtightening the plug.

What size sump plug washer fits a 2002 Forester?
The typical fitment is a 16 mm aluminium crush washer sized for the Forester’s oil drain plug. Sticking with a genuine-style aluminium gasket avoids sealing issues that can pop up with the wrong size or material.

What’s the correct torque for the sump plug on a 2002 Forester?
Torque the oil drain plug to about 44 N·m (around 32 ft·lb). That’s enough to crush the new washer and seal properly without stressing the sump threads.