Parts for your 2011 Honda Stream-Sump plug washers

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

Yes, the 2011 Honda Stream uses a sump plug washer. Honda’s workshop literature for the Stream RN6–RN9 (2006–2014) specifies installing the engine oil drain bolt with a new washer during oil changes, and the Honda parts catalogue lists a 14 mm aluminium crush washer for the drain plug (commonly referenced as “Washer, Drain Plug (14 mm)” P/N 94109-14000). Service procedures also call for tightening the drain bolt to around 39 N·m, which assumes a fresh crush washer is in place. Those technical references make the sump-plug-washer very much relevant to this vehicle.

On the 2011 Honda Stream, the sump-plug-washer is a small aluminium crush washer that sits between the sump (oil pan) and the drain bolt. Its job is simple but crucial: it deforms slightly as the bolt is tightened, creating a reliable seal so engine oil doesn’t weep or drip. Because it’s designed to crush once, it’s considered a single-use part. Reusing a flattened or scored washer can lead to annoying oil spots on the driveway, or worse, over-tightening the bolt to chase a seal and risking damage to the sump threads.

As part of routine servicing, it’s smart to replace the sump-plug-washer at every oil change. The correct size for the Stream is 14 mm internal diameter, and Honda typically uses aluminium. Stick with genuine or quality aftermarket equivalents, they’re cheap insurance. Before refitting, make sure the old washer has been removed (they can stick to the pan), wipe the sealing surface clean, and thread the bolt by hand to avoid cross-threading. Tighten to Honda’s spec of about 39 N·m. Avoid stacking washers or adding sealants — the crush washer does all the sealing work when torqued correctly.

Signs that the washer needs attention include a faint oil smell after a drive, dampness around the plug, or a slow drip. A fresh washer, the right torque, and clean mating surfaces will sort it. Magnetic or aftermarket drain bolts still require a crush washer — the principle doesn’t change. Keeping a few spares on the shelf makes DIY servicing easier and keeps the Stream tidy and leak-free.

• Use a new 14 mm aluminium crush washer every oil change.
• Tighten the drain plug to about 39 N·m — no more, no less.
• Confirm the old washer is removed and the surface is clean.

FAQs

What size sump plug washer does a 2011 Honda Stream use?
It uses a 14 mm internal diameter aluminium crush washer, as shown in Honda parts listings for the Stream RN6–RN9. This is the standard Honda oil drain gasket used across many models.

How often should the sump-plug-washer be replaced?
Replace it at every oil change. It’s a single-use crush washer, and swapping it each time ensures a proper seal without needing to overtighten the drain bolt.

What torque should the sump drain plug be tightened to?
Around 39 N·m is the commonly specified torque for Honda four-cylinder engines of this era, including the Stream. Always use a torque wrench and a fresh washer to achieve a consistent seal.