The engine oil drain plug on most Honda Ridgeline models is a 14mm hex-head bolt with M14x1.5 threads. This is the standard size you’re most likely to encounter during an oil change. Other drain plugs on the vehicle (such as those for transmission, transfer case, or differentials) vary by year and configuration, so always verify with the specific service manual for your model.
Engine oil drain plug: size and specs
Before you work on the oil pan, it helps to know the typical measurements you’ll need for a standard oil change. The Ridgeline’s engine oil drain plug is generally a 14 millimeter hex-head bolt with a metric M14x1.5 thread. This is paired with a copper crush washer that should be replaced at every oil change.
- Socket size: 14 mm for the hex head
- Thread size: M14 x 1.5
- Washer: copper crush washer (replace with each oil change)
- Applications: applies across most Ridgeline models with the 3.5L V6 engine from 2006 onward
In practical terms, keeping a 14mm socket, a new copper washer, and the correct drain plug nearby will cover routine oil changes on most Ridgeline engines. Always wipe the area clean before and after draining to ensure no debris enters the oil system.
Other drain plugs you may encounter
Beyond the engine oil pan, Ridgeline vehicles have other drain plugs—such as those for the transmission, transfer case, and differentials—whose sizes aren’t universal across all model years. The exact dimensions depend on the transmission type and year, so it’s essential to consult the appropriate service manual for your truck when planning a drain-and-fill procedure.
- Automatic transmission drain plugs: size varies by transmission model and year
- Manual transmission drain plugs: may differ from automatic configurations
- Transfer case and differential drain plugs: sizes depend on axle and drivetrain specifications
Because these plugs can differ between model years and configurations, relying on the official owner’s manual or a Honda service bulletin is the safest approach when servicing non-oil-pan drains.
How to confirm the exact size for your Ridgeline
To ensure you’re using the correct size for your specific Ridgeline, follow these steps:
Check the owner’s manual and service manual
Review the maintenance sections for oil changes and any other drain procedures. The manual will list the correct plug sizes and torque specifications for your exact year and transmission type.
Inspect the plug itself and measure if needed
If you don’t have the manuals handy, inspect the plug on the pan. The engine oil drain plug will typically have a 14mm hex head. If the plug is different, note the size and cross-reference with a parts diagram for your year.
Consult a dealer or qualified mechanic
When in doubt, contacting a Honda dealer or a trusted mechanic with your VIN ensures you get the correct plug size and washer type for transmissions, transfer cases, and differentials beyond the engine oil pan.
Summary
For most Honda Ridgeline models, the engine oil drain plug is a 14mm hex-head bolt with M14x1.5 threads, paired with a copper crush washer. This size covers the typical oil pan drain across a wide range of years. If you’re dealing with transmission, transfer case, or differential drains, sizes vary by model year and drivetrain, so always refer to the official manual or confirm with a Honda service professional before proceeding.