The standard oil drain plug size on most Honda Odyssey models with the 3.5-liter V6 is a 14mm hex-head plug (socket size). However, some older generations or regional variants can differ, so verify for your exact year and engine.
Oil drain plugs on Hondas use a metric thread (usually M14x1.5 for the 14mm plug). When performing an oil change, use a 14mm socket or wrench to remove/install, and replace the crush washer if your model requires one. Always consult the owner's manual or a dealership for the precise specification for your vehicle's year and engine.
Common size and how to verify
To confirm the plug size on your Odyssey, follow these steps:
- Check the owner's manual or service manual for the exact size and torque specification for your model year and engine.
- Inspect the drain plug head and measure the distance across the flats with a caliper or a ruler to determine the correct socket size (most Odysseys use a 14mm socket).
- Test-fitting sockets at the repair space: try common sizes (such as 12mm, 14mm, or 17mm) to identify which socket seats squarely on the plug without rounding.
- Inspect the crush washer and replace it if required when you reinstall the drain plug.
- If you’re unsure or the plug is damaged, have a professional service technician verify the size and perform the oil change.
Following these steps will help confirm you’re using the correct tool size and maintaining proper installation for your vehicle, avoiding damage to the drain plug or oil pan.
Summary
For most Honda Odyssey models with the common 3.5L V6 engine, the oil drain plug is a 14mm hex-head plug with a corresponding M14x1.5 thread. Always verify against your specific model year and engine by consulting the owner's manual or a Honda dealership, and use the correct socket and torque when changing the oil.