Parts for your 2008 Honda Odyssey-Sump plug washers

2008 Honda Odyssey Sump Plug Washers

Yes, a sump plug washer is used on the 2008 Honda Odyssey. Honda’s factory documentation calls it a new “drain plug washer” at each engine oil change. The 2005–2010 Honda Odyssey Service Manual (Engine Lubrication section) specifies fitting a new washer when refitting the sump/drain bolt and torquing to spec, and the 2008 Owner’s Manual maintenance instructions repeat the same guidance. Honda’s genuine parts catalogue also lists a 14 mm aluminium crush washer (commonly referenced as Washer, Drain Plug 14 mm, P/N 94109-14000) for this model.

On the Odyssey, the sump plug washer is a small, soft aluminium ring that does some very heavy lifting. Its job is to seal the engine’s oil pan at the drain bolt, stopping weeps and drips once the bolt is tightened to spec. Being a crush washer, it deforms once to match the mating surfaces. That one-time “crush” is what creates the reliable seal — which is why Honda advises replacing it every time the oil is changed.

During a routine service, the old washer should come off with the plug. A fresh washer slides on before the plug is reinstalled, then the plug is torqued correctly — Honda specifies about 39 N·m (29 lb·ft) for this generation Odyssey. Hand-thread the plug first to avoid cross-threading, then torque it up evenly. Over-tightening can distort the new washer or damage the pan threads, under-tightening can allow a slow leak.

Why bother replacing it? Reusing a crushed washer can lead to oil seeps, mess on the driveway, and a low-level oil loss that’s easy to miss. If there’s any sign of weeping around the plug, or if the washer looks flattened, gouged, or hard, bin it and fit a new one. They’re inexpensive and they save headaches.

• Replace the sump plug washer at every oil change (typically every 10,000 km or 12 months, or as suited to local conditions).
• Clean the mating surfaces on the plug and pan before refitting.
• Use a quality aluminium 14 mm crush washer that matches Honda’s spec.
• After the service, run the engine, switch off, and check for any seepage around the plug.

Done right, the Odyssey’s sump plug washer is a simple, set-and-forget bit of kit that keeps the V6 happy and the undertray clean.

Popular questions about 2008 Honda Odyssey sump plug washers

What size sump plug washer does a 2008 Honda Odyssey use?
It takes a 14 mm aluminium crush washer used with the engine oil drain bolt. Honda parts listings identify it as a 14 mm drain plug washer commonly referenced as P/N 94109-14000.

How often should the sump plug washer be replaced?
Replace it at every oil change. Honda’s service and owner information specify fitting a new washer each time the drain bolt is refitted, as the old washer has already been crushed and won’t seal as reliably again.

What torque should the sump plug be tightened to?
Tighten the engine oil drain plug to about 39 N·m (29 lb·ft). Start the bolt by hand, fit a fresh washer, then torque it accurately to avoid leaks or damage.