Parts for your 2015 Honda Civic-Sump plug washers

2015 Honda Civic sump plug washers — what they do and when to replace them

Yes, a sump plug washer is fitted to the 2015 Honda Civic. Honda’s own technical information specifies it. The 2015 Civic Owner’s Manual (Maintenance — Engine Oil) and the Honda Service Manual (Engine Oil Replacement) both instruct technicians to install a new drain bolt washer at each oil change, and the Honda Genuine Parts catalogue lists “Washer, Drain Plug (14 mm) — 94109-14000” for this model. Those sources make it clear the washer isn’t optional — it’s part of the designed oil-seal system.

On a 2015 Honda Civic, the sump plug washer is a soft aluminium crush washer that sits between the sump (oil pan) and the drain bolt head. When the bolt is tightened to the correct torque, the washer deforms slightly to create a gas- and oil-tight seal. That controlled crush is deliberate, it prevents annoying weeps, protects the sump’s sealing face, and helps the bolt reach the correct clamping load without over-tightening.

Because the washer is designed to deform, it’s considered single-use. Reusing it can leave a shallow groove or a hard-set ridge that won’t seal as well the second time around. The outcome is often a light oil sweat around the plug, drips on the driveway, or a bolt that feels like it needs “just a bit more” — which risks stripping threads. For this Civic, best practice is to fit a new genuine-style aluminium washer at every oil change.

Service tips for the 2015 Civic:

• Washer type: aluminium crush, listed by Honda as “14 mm” (part no. 94109-14000).
• Torque: tighten the drain bolt to 39 N·m (29 lbf·ft) on a clean, dry surface.
• Prep: wipe the sump face and bolt head, bin the old washer — don’t stack washers.
• After start-up: check for any seepage once the engine’s run and cooled.

Copper or fibre washers may physically fit, but Honda’s documentation assumes an aluminium crush washer and torque spec calibrated for it. Sticking with the OEM style avoids sealing quirks. Given the low cost, swapping the washer with each service is cheap insurance for the Civic’s engine, keeps it tidy underneath, and saves chasing minor leaks later.

Technical sources referenced: Honda 2015 Civic Owner’s Manual (Maintenance — Engine Oil), Honda Service Manual (9th Gen) — Engine Oil Replacement procedure, and Honda Genuine Parts Catalogue listing for Washer, Drain Plug (14 mm) 94109-14000.

Popular questions about 2015 Honda Civic sump plug washers

How often should the sump plug washer be replaced on a 2015 Civic?
Honda service literature calls for a new washer at every oil change. The aluminium crush design is single-use, replacing it each time maintains a reliable seal and the correct clamping load at the specified 39 N·m torque.

What size sump plug washer does the 2015 Civic use?
Honda lists a “Washer, Drain Plug (14 mm)” for this model under part number 94109-14000. It’s an aluminium crush washer matched to the Civic’s drain bolt and sump face.

What’s the correct torque for the drain plug on a 2015 Civic?
The factory spec is 39 N·m (29 lbf·ft). Always tighten on a clean, dry surface with a fresh washer, avoid over-tightening to protect the sump threads and ensure the washer seals as intended.