Parts for your 2012 Honda Stream-Sump plug washers

2012 Honda Stream sump-plug-washers — what they do and when to replace them

Yes — the 2012 Honda Stream is designed to use a sump-plug-washer on the engine oil drain plug. Honda’s service literature for the Stream (RN6–RN9 series, R18A/R20A engines) calls for “replace drain plug washer” at each oil change, and specifies tightening the plug to about 39 N·m (29 lb·ft). Honda parts catalogues list a 14 mm aluminium crush washer (commonly referenced as drain plug washer, 14 mm, Honda P/N 94109-14000) for this application. That’s standard Honda practice across similar Civic/Stream platforms.

What’s the point of sump-plug-washers? They’re soft, single-use sealing rings that sit between the sump (oil pan) and the drain bolt. When the bolt is torqued, the washer “crushes” slightly to conform to the mating surfaces, creating a fluid-tight seal. On the 2012 Honda Stream, this prevents annoying oil weeps, helps the bolt reach correct clamp load at the specified torque, and protects the alloy sump face from damage caused by over-tightening to chase a seal.

As part of routine servicing, it’s good form to replace the sump-plug-washers at every oil change. They’re inexpensive, and swapping one takes seconds while the plug is out. Reusing a flattened washer risks slow seepage that can mist the underbody, attract grime, and give a false impression of bigger leaks. It can also tempt over-tightening, which is rough on threads — not a repair anyone wants.

For Stream owners in Aus and NZ, grab a couple of genuine 14 mm aluminium washers and keep them with your oil filter. When refitting the plug, clean the sump face, fit a fresh washer, then torque the plug to 39 N·m. No need to go gorilla on it. After the first drive, a quick look under the bonnet and a glance at the sump is a smart habit, if it’s bone dry, you’re golden.

• Always use a new 14 mm aluminium sump-plug-washer.
• Tighten the drain plug to 39 N·m (29 lb·ft).
• Inspect for drips after the first heat cycle, recheck torque only if there’s evidence of seepage.

That’s all there is to it — an easy, low-cost step that keeps the 2012 Honda Stream tidy and leak-free between services.

Popular questions about 2012 Honda Stream sump-plug-washers

What size sump-plug-washer does a 2012 Honda Stream use?
The 2012 Stream typically uses a 14 mm aluminium crush washer on the engine oil drain plug. It’s the standard Honda drain plug washer size across the R18A and R20A engines used in this model range.

How often should the sump-plug-washer be replaced?
Replace the sump-plug-washer at every oil change. It’s a single-use crush washer, once compressed, it won’t seal as reliably the second time and can lead to small leaks.

Can the old sump-plug-washer be reused if it looks fine?
Best not. Even if it looks okay, a previously crushed washer won’t provide the same sealing or correct clamp load. A new washer is cheap insurance against leaks and stripped threads.