Parts for your 2009 Honda Civic-Sump plug washers

2009 Honda Civic sump plug washers

Based on Honda’s factory information — the 2006–2011 Civic Service Manual (Engine Lubrication section) and the 2009 Civic Owner’s Manual — the engine oil drain plug uses an aluminium crush washer and it’s intended to be replaced at every oil change. Honda lists a 14 mm sealing washer (commonly referenced as p/n 94109-14000) for the drain bolt, with the drain plug tightened to 39 N·m (29 lbf·ft). So, sump plug washers are absolutely relevant and fitted on the 2009 Honda Civic.

For the 2009 Honda Civic, the sump plug washer is a small, soft aluminium ring that seals the engine oil drain bolt against the sump. When the bolt is tightened to spec, the washer “crushes” slightly to fill any tiny gaps, preventing weeps and drips. It’s a simple, inexpensive part that does a big job — keeping the oil where it belongs and the driveway clean.

As part of routine servicing, it’s best practice to replace the crush washer at each oil change. Honda’s own guidance backs this up, because once a crush washer has been compressed, it won’t spring back to seal properly a second time. Reusing it can lead to slow leaks, oil smell on a hot exhaust, and the temptation to overtighten the bolt — which can strip threads in the alloy sump.

Good workshop habits for the Civic include:

• Always fit a new 14 mm aluminium crush washer to the drain plug at every oil change.
• Clean the sump’s sealing face and the plug head before refitting.
• Tighten the drain plug with a torque wrench to 39 N·m — not “as tight as it’ll go”.
• Check the plug and washer area after the first short drive for any sign of a weep.

Most quality aftermarket 14 mm aluminium washers will do the trick, but sticking with OEM-style dimensions avoids hassles. The Honda washer is symmetrical, so orientation isn’t critical — just seat it squarely and torque the plug correctly. There’s no need for thread tape or sealant, if the washer and threads are in good nick and torqued to spec, it’ll seal perfectly. For drivers in Australia and New Zealand clocking up plenty of kilometres, fresh oil and a fresh washer every service is cheap insurance for a long-lived R18 engine.

Popular questions about 2009 Honda Civic sump plug washers

What size sump plug washer does a 2009 Honda Civic use?
The 2009 Civic uses a 14 mm aluminium crush washer designed for the engine oil drain bolt. It matches Honda’s common specification for this generation, ensuring a proper seal without needing sealants.

How often should the sump plug washer be replaced?
Replace it at every oil change. Once crushed, the washer can’t reliably reseal, and reusing it risks slow leaks or overtightening the plug. It’s a low-cost part that protects the sump threads and keeps the system leak-free.

What’s the correct torque for the drain plug on a 2009 Civic?
Tighten the drain plug to 39 N·m (29 lbf·ft). Using a torque wrench is the best way to get a solid seal from the crush washer without damaging threads in the alloy sump.