Parts for your 2018 Honda Odyssey-Sump plug washers

2018 Honda Odyssey sump-plug-washers — what they do and when to replace them

Yes, the 2018 Honda Odyssey uses a sump-plug washer (also called a crush washer). Honda’s factory service information and the 2018 Odyssey Owner’s Manual oil-change procedure specify refitting the engine oil drain bolt with a new washer and tightening it to about 39 N·m (29 lbf·ft). Those technical sources are clear that the washer is a service item designed to be replaced every time the oil is changed.

On this model, the sump-plug washer is a soft metal ring that sits under the drain bolt head. When the bolt is tightened, the washer deforms slightly to create a fluid-tight seal between the bolt and the alloy sump. That single-use “crush” action is the whole point: it prevents annoying drips on the driveway, protects the sump’s sealing face, and means the bolt doesn’t have to be overtightened to stop leaks.

For owners across Australia and New Zealand, treating the sump-plug-washer as a consumable is the simplest way to keep the Odyssey happy at service time. During an engine oil change, the bolt comes out, the old washer is removed and binned, the seating face is wiped clean, and a fresh washer is installed before the bolt is refitted and torqued to spec. Reusing an old washer can lead to weeping leaks, rounded bolt heads from over-tightening, or even damage to the sump threads.

Genuine-style 14 mm Honda crush washers are inexpensive, and it’s smart to keep a few on hand. They’re designed for one-time compression, so even if the old one “looks fine”, it won’t seal as reliably the second time. When fitted correctly, the new washer provides the right seal with the correct torque, so there’s no need to lean on the spanner.

• Replace the sump-plug washer at every oil change.
• Clean the bolt and sump mating surfaces before refitting.
• Tighten the drain bolt to about 39 N·m (29 lbf·ft).
• Avoid stacking washers or using sealants, use a single new crush washer.

Technical references: Honda service information for the 2018 Odyssey and the Owner’s Manual engine oil replacement procedure both direct technicians to install the drain bolt with a new washer and torque it to specification. That’s why sump-plug-washers are absolutely relevant on this vehicle.

Popular questions about 2018 Honda Odyssey sump-plug-washers

What size sump-plug washer does the 2018 Odyssey use?
It uses a 14 mm Honda-style crush washer for the engine oil drain bolt. Stick with a genuine or OEM-quality aluminium washer so it compresses correctly and seals first go. Don’t stack washers to “make up” thickness—use one new washer only.

How often should the sump-plug washer be replaced?
Every engine oil change. The washer is designed to crush once, so reusing it increases the risk of seepage and can tempt over-tightening. Keeping a small pack of washers in the garage makes servicing straightforward.

What torque should the drain bolt be tightened to?
Around 39 N·m (29 lbf·ft) for the engine oil drain bolt on the 2018 Odyssey. Using a torque wrench helps avoid stripping threads and ensures the new washer seals as intended.