Parts for your 2008 Honda Stream-Sump plug washers

2008 Honda Stream sump plug washers – what they do and when to replace them

Yes, the 2008 Honda Stream uses a sump plug washer. Technical sources including the Honda Stream 2007–2011 workshop manual for the R18A/R20A engines, the Honda Electronic Parts Catalogue, and general Honda service literature (plus Civic 2006–2011 Haynes coverage of the same R‑series layout) specify an aluminium crush washer on the engine oil drain bolt. The washer is a 14 mm crush type (Honda part number commonly listed as 94109-14000), with the drain bolt torqued to 39 N·m (29 lb·ft). That means a sump plug washer is absolutely relevant to the 2008 Honda Stream.

The sump plug washer’s job is simple but critical: it deforms slightly as the drain bolt is tightened, creating a reliable seal between the bolt head and the alloy sump. This one-time crush action compensates for minor surface imperfections and thermal cycling, helping to prevent weeps and drips that can leave spots on the driveway or, worse, allow oil loss over time.

For servicing, replacing the washer at every oil change is the go-to recommendation from Honda. Reusing a crushed washer risks poor sealing, which can lead to a slow leak or the temptation to overtighten the bolt. Overtightening can strip threads in the alloy pan—an expensive headache no owner needs.

During an oil change on a 2008 Honda Stream (R18A 1.8 or R20A 2.0), the best practice is to remove and discard the old washer, clean the mating face on the sump, fit a new 14 mm aluminium crush washer, and tighten the drain bolt to 39 N·m with a torque wrench. After a warm-up, a quick check around the plug for any misting or drips is good form.

Quality matters, so a genuine Honda washer or a reputable aftermarket equivalent with the correct dimensions is recommended. Copper washers exist, but Honda specifies aluminium for the Stream’s sump design and torque spec. If the sump has had previous thread repairs or the face is nicked, a careful inspection and light dressing may be needed to restore a perfect seal.

• Replace the washer at every oil change.
• Use a torque wrench: 39 N·m (29 lb·ft).
• Never stack washers or reuse a crushed one.

Popular questions about 2008 Honda Stream sump plug washers

What size sump plug washer does the 2008 Honda Stream use?
The 2008 Stream uses a 14 mm aluminium crush washer on the engine oil drain bolt. Honda commonly lists it as part number 94109-14000. The drain bolt thread is M14 x 1.5, and the washer is designed to compress once for an oil-tight seal.

How tight should the sump plug be on a 2008 Honda Stream?
Honda specifies 39 N·m (29 lb·ft). Using a torque wrench is recommended to avoid undertightening (which can cause leaks) or overtightening (which can damage the alloy sump). Always fit a new washer before torquing the bolt.

Can the sump plug washer be reused?
Honda’s service guidance treats the aluminium washer as single-use. Once it’s crushed, it won’t seal as intended the next time. If a reused washer is unavoidable in a pinch, checking closely for weeps after the service is wise, but replacement at the next opportunity is strongly advised.