What size washer is the oil drain plug on a Honda Civic?
The drain plug on most Honda Civics uses a copper crush washer sized for an M14x1.5 drain plug, with an inner diameter around 14 mm and an outer diameter typically in the 18–20 mm range. Exact dimensions can vary by year and engine, so always verify against your specific model’s service information.
Typical configurations you’ll encounter on Civics
Below is a concise guide to the common drain plug washer sizing you’ll likely encounter. These details apply to the majority of modern Civics but may vary by year or engine code.
- Standard setup: M14x1.5 drain plug paired with a copper crush washer. Washer outer diameter generally about 18–20 mm; inner diameter about 14 mm to match the bolt shank.
- Variations: Some older or niche Civics may use different thread sizes or washer dimensions. When in doubt, check the OEM service diagram or bring the old washer to compare.
Most Civics built in the last couple of decades follow the M14x1.5 pattern with a copper washer sized to seat against the oil pan and drain plug securely. If your vehicle diverges from these norms, consult the owner's manual or a Honda dealer parts diagram for your exact year and engine code.
How to verify or replace the washer
Before replacing or purchasing a washer, it helps to confirm the correct size for your particular Civic, especially if you’re performing maintenance yourself.
- Locate the oil drain plug on the oil pan and remove the plug to inspect or replace the washer.
- Measure or confirm the drain plug thread size (most Civics use M14x1.5). If you’re unsure, consult the service manual for your engine code.
- Choose a copper crush washer with an inner diameter close to 14 mm and an outer diameter near 18–20 mm, or buy the OEM washer specified for your year/model.
- Install a new washer, reinstall the drain plug, and torques per the manufacturer’s specification for your Civic model to ensure a proper seal.
Tip: Using a new washer is important to prevent oil leaks. If you’re unsure of the exact size, taking the old washer to an auto parts store can help you match the correct size, or you can order the OEM washer by your specific Civic year and engine code.
Summary
For most Honda Civics, the oil drain plug uses a copper crush washer sized for an M14x1.5 bolt, with an inner diameter around 14 mm and an outer diameter around 18–20 mm. Always confirm with your exact year and engine code, and replace the washer with a new one during oil changes to ensure a proper seal.
What size is the oil drain plug on a Honda Civic?
The Honda Civic oil drain plug typically has an M14x1.50 thread and requires a 17mm socket or wrench to remove and install. It is important to use a new crush washer for each oil change to ensure a proper seal.
- Thread size: M14x1.50
- Socket/wrench size: 17mm
- Replacement part: Use a new crush washer with every oil change.
What size is the oil drain plug washer on a Honda?
The most common Honda oil drain plug washer size is 14mm inner diameter, with a 22mm outer diameter and a 2mm thickness. It is a "crush washer" with the part number 94109-14000 and is recommended for replacement at every oil change to ensure a leak-free seal.
Key specifications
- Inner Diameter: 14mm (or 0.55 inches)
- Outer Diameter: 22mm (or 0.86 inches)
- Thickness: 2mm (or 0.08 inches)
- Part Number: 94109-14000
- Material: Aluminum
Why replace the washer
- Prevents leaks: The washer's purpose is to crush and seal the drain plug against the oil pan, preventing oil leaks.
- Single-use: It is designed to be a one-time use crush washer. Reusing it can lead to leaks and a damaged oil pan.
- Recommended practice: Replacing it with a new one is a highly recommended part of the oil change process to ensure a proper seal.
What size is the drain plug washer on a 2008 Honda Civic?
2008 Honda Civic Washer, Drain Plug (14MM)
Can you reuse Honda Crush washers?
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