What size socket for Subaru Outback drain plug?
The engine oil drain plug on most Subaru Outback models takes a 14 mm socket. This is the standard for modern Outbacks, but you should verify on your specific year and engine by inspecting the plug head or checking the owner's manual.
Engine oil drain plug size
For the engine oil drain plug, the hex head is typically 14 mm across flats, so a 14 mm socket (with six-point grip recommended) is the right tool for removal and reinstallation. If the head looks different or you have a nonstandard plug, stop and confirm the size before forcing a tool onto it to prevent stripping the bolt.
Tools and supplies to have on hand when performing an oil change on a Subaru Outback include the following items.
- 14 mm socket (preferably six-point for better bite)
- Oil drain pan large enough to catch used oil
- Shop rags or paper towels
- Protective gloves
- Replacement oil filter and a new crush washer for the drain plug
- The correct grade and quantity of engine oil for your model
- Optional: a torque wrench or breaker bar for steady removal and reinstallation
With these supplies ready, you can proceed to safely drain the old oil, replace the filter and washer as needed, and reinstall the drain plug according to the manufacturer’s specifications.
Verify the size on your specific Outback
To avoid damage from using the wrong size, follow these steps to confirm the correct plug size for your exact model year and engine:
- Locate the oil drain plug at the bottom of the engine oil pan.
- Inspect the plug head: a 14 mm hex head is typical for most Outbacks; if it looks different, do not force a 14 mm socket onto it.
- Measure or compare the head with a set of metric sockets to confirm the correct size before attempting removal.
- If you’re unsure or the plug is damaged or rounded, consult the owner's manual, a Subaru service manual, or a dealer to confirm the proper size and avoid further damage.
- Proceed with the oil change once you’ve confirmed the correct size and ensured tools will seat properly.
Summary
For Subaru Outback models, the engine oil drain plug most commonly requires a 14 mm socket. Always verify by inspecting the plug head or consulting the owner's manual for your specific year and engine. Prepare the right tools, follow the official torque guidance, and replace the crush washer as needed to maintain a proper seal and avoid leaks. Regular oil changes with the correct tools help keep your Outback running smoothly.
