The oil drain plug on a Honda Insight typically uses a 14 mm hex head with an M14 x 1.5 thread.
Details follow: while this size covers most Insights across generations, variations can occur by model year and engine variant. Always consult the owner's manual or a service manual for your exact car to confirm.
Plug size and specs: a quick reference
Below is a concise reference to help you identify and service the drain plug on most Honda Insights. Use this before you begin an oil change or when sourcing replacement parts.
- Head size: 14 mm hex (fits a 14 mm socket or wrench).
- Thread size: M14 x 1.5 standard thread for many Honda engines.
- Washer: copper or aluminum sealing washer is commonly used and should be replaced when the plug is reinstalled.
- Torque: typically in the approximately 22–29 ft-lbs (30–40 Nm) range, but check the specific manual for your year and engine variant.
Using the correct head size and thread ensures a proper seal and helps prevent stripped plugs or leaks.
How to verify for your exact model
Because Honda has produced multiple Insight generations with different engines, it’s wise to verify your exact specifications rather than assume a single standard. Here are practical steps to confirm the correct plug size for your car.
- Consult the owner's manual or a factory service manual for your year/model to confirm the drain plug size and torque spec.
- Inspect the underside of your oil pan to see the plug head or available space for a 14 mm socket; look for any markings near the plug that indicate size.
- If you’re replacing the washer, carry a copper/aluminum washer that matches the drain plug diameter and thickness used by Honda.
When in doubt, a quick check with a correctly sized 14 mm socket or a torque wrench set to the manufacturer’s specification will ensure a proper fit without damaging threads.
Generation notes (overview)
First-generation Insight (1999–2006)
The early Insight models generally share the same 14 mm drain plug size, but always verify via the service manual for any regional variations or updates to torque recommendations.
Second-generation Insight (2009–2014)
Second-generation engines maintained the standard 14 mm hex head in most markets; however, some regional service bulletins mentioned minor torque adjustments, so confirm for your exact engine code.
Third- and beyond (2014–present in many markets)
Modern Insights commonly use the same 14 mm plug size, with engine updates occasionally affecting torque values. Always reference the specific model year’s documentation to ensure accuracy.
Bottom line for DIYers
The standard oil drain plug size for most Honda Insights is a 14 mm hex head with M14 x 1.5 thread, commonly paired with a copper washer and a torque in the low-to-mid 30 Nm range. If your vehicle differs by year or region, verify with the official manual or a trusted repair guide before purchasing parts or applying torque.
Summary
For most Honda Insight models, expect a 14 mm drain plug with M14 x 1.5 threading and a copper washer, installed to a torque of roughly 30–40 Nm (approximately 22–29 ft-lbs). Always check the exact model-year manual to confirm, as there can be small variations by generation and market.