Parts for your 2011 Honda Odyssey-Sump plug washers

2011 Honda Odyssey sump-plug-washers — what they do and when to replace them

Yes, the 2011 Honda Odyssey uses a sump plug washer (also called a crush washer). This isn’t guesswork — Honda’s own technical literature backs it up. The Owner’s Manual oil change procedure instructs replacing the drain bolt washer each time the oil is changed, the Honda service manual specifies the same along with the drain bolt torque, and the genuine Honda parts catalogue lists a 14 mm aluminium drain plug washer for the engine (commonly referenced as washer 94109-14000). For reference, the automatic transmission drain uses a different, larger washer (commonly 90471-PX4-000), but for engine servicing, it’s the 14 mm aluminium sump-plug-washer that matters.

On the 2011 Odyssey’s J35 V6, the sump-plug-washer is a small, single-use aluminium ring designed to deform slightly when the drain bolt is tightened. That controlled crush creates a reliable seal between the bolt and the alloy sump, preventing weeps and drips that can muck up the driveway or, worse, lead to gradual oil loss.

Best practice is to replace the sump-plug-washer at every engine oil service. It’s a cheap part that protects the sump threads and keeps the seal trustworthy. Reusing an old washer can look fine at first, but once it’s been crushed, it won’t seal the same way again. If a washer has been reused a few times, it can encourage over-tightening to chase a seal — that’s how sump threads get damaged.

When fitting a new washer, wipe the sump face clean, install a fresh aluminium washer on the bolt, and tighten the drain bolt to the factory spec (commonly 39 N·m / 29 lb‑ft as specified in Honda service info for this generation). After the engine has run and warmed, have a quick look for any seepage around the plug. If it’s dry after a short drive, you’re golden.

Handy tips for Odyssey owners in Aus and NZ:

• Keep a small stash of genuine‑spec 14 mm aluminium washers with your oil filter — they’re inexpensive and save a trip mid-service.
• Avoid copper or fibre substitutes unless they’re specified to the same dimensions and sealing style, Honda designs these plugs around soft aluminium crush washers.
• If the plug or sump face is nicked, replace the plug and dress the face lightly before refitting.

FAQs

Does a 2011 Honda Odyssey need a new sump-plug-washer at every oil change?
Honda’s service guidance says yes — the aluminium washer is single-use. Swapping it each service maintains a proper seal and helps avoid over-tightening the drain bolt to chase leaks later on.

What’s the correct torque for the Odyssey’s sump plug?
Honda service information for this generation specifies about 39 N·m (29 lb‑ft) for the engine oil drain bolt. Always fit a fresh 14 mm aluminium washer before torquing the plug.

Can a copper washer be used instead of the Honda aluminium washer?
Aluminium is the specified material for the Odyssey’s engine sump-plug-washer. While some copper washers can work, Honda engineered the seal for aluminium crush characteristics. If not using genuine, match the exact size and style, and check carefully for leaks.