The drain plug for most Honda engines uses a 14 mm hex head and an M14 x 1.5 thread, though exact sizes can vary by model and year.
In this article, we explain the typical sizes, note the exceptions you might encounter, and show how to verify the exact specification for your specific Honda using the owner's manual, service manual, or direct measurement.
Typical drain plug sizes across Honda engines
These guidelines cover the head size, thread pitch, and sealing layout seen on most modern Hondas. Always verify for your exact model.
Common engine families
- Head size and tool requirement: 14 mm hex head (fits a 14 mm socket or wrench) for the drain plug on most current Honda engines.
- Thread size: the drain plug is typically M14 x 1.5 on the majority of Honda engines.
- Seal: a copper crush washer (or an integrated gasket) is commonly used to seal the drain plug on Hondas.
- Exceptions: some older or specialty engines may differ in head size or thread pitch; always verify with the service manual for your exact model and year.
For your exact model, consult the official Honda service manual or the OEM parts catalog to confirm the head size, thread pitch, washer type, and torque specification.
How to verify for your specific Honda
To ensure you have the correct drain plug size before performing an oil change, follow these steps:
- Find your engine code and model year from the VIN plate, owner's manual, or service documentation (examples: R18A, K24, F22, J35).
- Look up the exact drain plug size and torque spec in the official Honda service manual or owner's manual for your engine.
- Inspect the actual drain plug on the oil pan: check the head size with a 14 mm socket to see if it fits; if it doesn’t, verify the correct size for your engine family.
- When replacing the plug, use the correct crush washer or gasket as specified and tighten to the recommended torque (often listed in the manual; typical values for Hondas are in the 20–30 ft-lbs range, but verify).
- If you cannot determine the correct size from documentation, contact a Honda dealer or a qualified technician to confirm before draining the oil.
Following these steps helps ensure a proper seal and avoids stripping the drain plug or mis-sizing the plug.
Summary
In most Honda models, the oil drain plug uses a 14 mm hex head and an M14 x 1.5 thread. This configuration is common across many modern Honda engines, including several K- and L-series designs. However, variations exist by model and year, and some older engines may differ. Always verify by consulting the owner's manual or service manual or by inspecting the plug directly, and use the correct crush washer and torque specification to maintain a proper seal.