What size socket for Ford F150 oil drain plug?
The standard socket size for the oil drain plug on most Ford F-150s is 14 mm. Some engines, years, or trims may use 13 mm or 15 mm, so verify your specific truck before loosening the plug.
Understanding the common sizes
Oil drain plugs are hex-headed bolts. For the F-150, the most common hex size you’ll encounter is 14 mm. In a few cases, particularly on older model years or certain engines, you might encounter 13 mm or 15 mm heads. Using the wrong size can round off the head, so it’s important to check.
To help you identify the correct size, consider these possibilities and verification steps:
- 14 mm hex head — the default for the majority of F-150 engines and model years.
- 13 mm hex head — may appear on some earlier configurations or specialty builds.
- 15 mm hex head — rare, but possible on a few engines or aftermarket replacements.
- If the plug isn’t a standard hex or is damaged, do not force a socket; inspect or replace the plug.
With the right socket, you’ll minimize the risk of stripping and ensure a clean removal and re-installation.
How to confirm the size for your exact Ford F-150
Follow these steps to verify the exact socket size for your truck:
- Park on a level surface and place a drain pan underneath the oil pan.
- Locate the oil drain plug on the bottom of the pan; it will be threaded into the pan with a flat hex head.
- Try sockets starting at 14 mm; if it’s loose or won’t engage, switch to 13 mm, then 15 mm until you find the snug fit that turns smoothly without slipping.
- Consult your owner's manual or the service manual for the exact spec for your engine code (for example, 3.5L EcoBoost, 5.0L V8, etc.).
When in doubt, consult a professional or a Ford dealer service department for the exact specification for your year and engine code.
When to seek professional help
If you cannot identify the correct size, or if the drain plug head looks damaged, stop and have the plug inspected by a mechanic. Using the wrong size can strip the bolt or damage the oil pan.
Summary
For most Ford F-150 models, a 14 mm socket is the standard choice for the oil drain plug. Some models may require 13 mm or 15 mm heads. Always verify by checking the owner’s manual or trying the socket sizes carefully on the undamaged plug, and avoid forcing a misfit. After removing and re-installing the drain plug, torque to the OEM specification and replace any sealing washer as recommended by Ford’s service guidelines.
