The engine oil drain plug on most Honda engines takes a 14mm socket; some models use a 17mm head. Always verify for your specific vehicle by checking the owner's manual or inspecting the plug head before attempting to remove it.
Common sizes you may encounter on Honda engines
The following list covers sizes that are frequently reported for Honda engine oil drain plugs. Use this as a starting point, but confirm with your exact model and year.
- 14mm hex (across flats) — by far the most common size for many Honda gasoline engines.
- 17mm hex — required on a subset of Honda models or specific engine years; not universal across all Hondas.
Because plug head sizes can vary by model and production year, always double-check the actual plug on your vehicle before buying or using a socket. For best results, verify with the official manual for your car.
How to confirm the exact size for your specific Honda
- Check the owner's manual or service manual for your exact model and year to locate the recommended drain plug size or torque specification.
- Inspect the plug head directly: compare it to a 14mm and a 17mm socket to determine which fits snugly without forcing.
- If you’re unsure, start with a 14mm socket. If it won’t seat properly or feels loose, try a 17mm socket rather than forcing the plug.
- Remember that some engines may use a different configuration (or a different tool type) for other drains (transmission, coolant). Confirm model-specific guidance for those components.
If you still can’t determine the correct size, consult a dealer or a qualified mechanic. Using the wrong socket can strip the head or damage the plug and surrounding threads.
Note on transmission and other drain plugs
The question focuses on the engine oil drain plug. Honda transmissions, differentials, and coolant drain plugs may require other socket sizes and tools. Always verify per component and model, especially on newer vehicles or those with a specific engine family.
Summary
For most Honda models, plan to use a 14mm socket for the engine oil drain plug, with 17mm as a possible alternative on certain models. Always confirm with the vehicle’s manual or by inspecting the plug head to avoid damage. A quick check before you drain saves time and prevents costly mistakes.