Parts for your 2007 Subaru Forester-Sump plug washers

2007 Subaru Forester sump-plug washers

Yes — the 2007 Subaru Forester uses a sump plug washer (also called a crush washer). This isn’t guesswork: multiple technical sources specify replacing the drain plug gasket at every engine oil change and give a torque value for the plug when installed with a new washer. Technical references include the Subaru Forester Service Manual for 2006–2008 (Engine Lubrication section), the 2007 Forester Owner’s Manual (maintenance section), and Subaru’s electronic parts catalog, which lists an aluminium oil drain plug gasket commonly noted as P/N 803916010 for EJ-series engines of this era.

The sump plug washer on a 2007 Forester has one job: seal the oil drain plug to the sump so engine oil stays where it should. It’s a soft, single-use aluminium ring that deforms slightly when the plug is torqued up, filling microscopic gaps between the plug flange and the sump face. That crush action gives a reliable, leak-free seal without overtightening the plug — perfect for Aussie and Kiwi conditions where heat cycles and long runs are the norm.

As part of regular servicing, it’s good practice to replace the washer at every oil change. Subaru’s service literature explicitly calls for fitting a new drain plug gasket, then tightening the plug to the specified torque (commonly cited around 44 N·m). Reusing a flattened washer can lead to weeping oil, a plug that works loose, or the temptation to crank it tighter than spec — which risks damaging the sump threads. A fresh washer lets the correct torque do its job.

When swapping the washer, give the sump’s sealing face and the plug flange a quick clean so there’s no grit to score the surfaces. Don’t add sealants — they aren’t needed and can shed into the oil. If the old washer has stuck to the sump, gently peel it off rather than stacking a new one on top. The genuine Subaru aluminium washer (commonly catalogued as P/N 803916010 for this model) or a quality equivalent is the way to go, it’s non-directional, so orientation isn’t a worry. After the change, a quick look under the Forester after the first drive is a smart move — no drips means the crush washer and torque are spot on.

Technical sources referenced: Subaru Forester Service Manual 2006–2008 (Engine Lubrication section—oil replacement procedure), 2007 Subaru Forester Owner’s Manual (Maintenance and service—engine oil), Subaru Global/Regional Parts Catalog listings for 2007 Forester EJ25 oil drain plug gasket (aluminium crush type, commonly P/N 803916010).

What’s the correct sump plug washer part for a 2007 Subaru Forester?

For EJ25-powered 2007 Forester models (including XT), Subaru commonly lists an aluminium oil drain plug gasket as P/N 803916010. Genuine or a quality equivalent works well. If in doubt, quote the VIN at the parts counter to confirm the latest supersession.

How tight should the sump plug be on a 2007 Forester?

With a new crush washer fitted, Subaru service information typically specifies about 44 N·m of torque. Using the correct torque with a fresh washer gives a reliable seal without over-stressing the sump threads. Always verify against the service manual for your exact variant.

Can the old washer be reused?

It’s not recommended. The aluminium ring is designed to crush once to form a seal. Reusing it can lead to seepage or overtightening. Keep a few spares on hand and replace it at every oil change.