Parts for your 2019 Honda Civic-Sump plug washers

2019 Honda Civic sump plug washers

Technical sources confirm that the 2019 Honda Civic does use a sump plug washer (also called a drain bolt gasket). The Honda Factory Service Manual for the 10th‑gen Civic (2016–2019, Engine Lubrication) specifies “Always use a new drain bolt washer” and to tighten the drain bolt to about 39 N·m (29 lbf·ft). Honda Genuine Parts catalogues list a 14 mm aluminium crush washer for the 2019 Civic family (commonly p/n 94109‑14000), covering both 1.8 i‑VTEC and 1.5 VTEC Turbo variants.

On a 2019 Honda Civic, the sump plug washer is a small but crucial seal that sits between the engine’s sump (oil pan) and the drain bolt. When the bolt is torqued, the soft aluminium washer “crushes” slightly to form a tight, leak‑free seal. That crush action compensates for tiny surface imperfections and helps protect the sump threads by achieving the right clamping force without overtightening.

Because it’s designed to deform once, the washer is a single‑use item. Reusing it can lead to weeping around the plug, messy oil spots on the driveway, and in worst cases, an under‑torqued bolt that can back out or an over‑torqued bolt that risks damaging the sump. That’s why Honda’s service literature calls for replacing the washer at every oil change.

For routine servicing in Australia and New Zealand, it’s smart to keep a couple of genuine‑spec 14 mm aluminium crush washers on hand. During an oil change, the tech should remove the old washer, clean the mating surface on the sump, fit a fresh washer, then torque the drain bolt to the specified 39 N·m. No sealant is required or recommended.

Good practice on a Civic service includes:

• Always fit a new, correct‑size aluminium crush washer—don’t stack washers or mix materials.
• Torque the drain bolt accurately, avoid “feel” tightening with a long breaker bar.
• Wipe down and check for seepage after the first short drive, retorque only if required.

Done right, a $2 washer saves time, oil, and headaches—and keeps the Civic’s engine tidy between services.

FAQs

What size sump plug washer does a 2019 Honda Civic use?
The 2019 Civic typically uses a 14 mm aluminium crush washer that matches the drain bolt shoulder. Genuine Honda listings commonly show p/n 94109‑14000 for this application across most trims.

How often should the sump plug washer be replaced?
Every oil change. It’s a single‑use crush washer that’s designed to deform once for a perfect seal. Reusing it increases the chance of leaks and incorrect clamping force.

What torque should the sump plug be tightened to?
Honda service information for the 10th‑gen Civic specifies about 39 N·m (29 lbf·ft). Using a torque wrench helps avoid stripping threads and ensures the new washer seals correctly.