What size is the oil drain plug on a 2017 Subaru Outback?
The oil drain plug on the 2017 Subaru Outback uses a 14 mm hex head and an M20 x 1.5 thread; use a 14 mm socket to loosen and tighten it.
Engine variants and plug details
The 2017 Outback was offered with two main engines: the 2.5L FB25 four-cylinder and the 3.6L EZ36 six-cylinder. In most cases, both use the same basic drain plug design (14 mm head, M20 x 1.5 thread), but exact torque specifications and whether a crush washer is required can differ by engine and VIN. Always refer to the official service manual for your exact vehicle to confirm specifications.
Variants in the 2017 Outback
Engine-specific guidance helps ensure proper sealing and torque. While the plug head remains 14 mm for these engines, Subaru may call for slightly different washer usage or tightening torque depending on the model year range and production batch. Checking the VIN-specific service information is the best practice.
Key specifications
Below are the core sizing details you should know before servicing the drain plug.
- Head size: 14 mm hex (requires a 14 mm socket or wrench)
- Thread size: commonly M20 x 1.5
- Torque target: typically about 22–29 Nm (16–21 ft-lbs); verify for your engine and washer type
These figures reflect standard practice for 2017 Outback models, but always consult the official manual for your exact vehicle.
Tools and preparation
Gather these tools and materials before starting an oil change to ensure a clean, proper service.
- 14 mm socket or wrench
- Drain pan and rags for catching used oil
- New copper/aluminum crush washer for the drain plug (or the washer specified by Subaru)
- Torque wrench for accurate tightening
- Gloves and eye protection
- Fresh engine oil and a new oil filter if performing a full oil change
Having the right tools helps ensure a proper seal and prevents accidental overtightening or leaks.
Procedure: removing and reinstalling the drain plug
Basic steps to follow during an oil change.
- Warm the engine to circulating temperature and place the vehicle over a drain pan.
- Loosen the drain plug with a 14 mm socket counterclockwise, allowing oil to drain completely.
- Remove the plug, inspect and replace the crush washer if present, and clean the plug threads.
- Reinstall the drain plug by hand, then tighten to the recommended torque (approximately 22–29 Nm).
- Refill the engine with the correct oil amount and type, run the engine briefly, check for leaks, and top off if needed.
Always verify torque with a torque wrench and monitor for leaks after the oil has settled. If a leak is present, recheck washer seating and reinstall torque to spec.
Summary
For the 2017 Subaru Outback, the oil drain plug is a 14 mm hex head with a typical M20 x 1.5 thread. Tighten to about 22–29 Nm (16–21 ft-lbs) and replace the washer as recommended. Refer to the vehicle’s official service manual for any VIN-specific differences and exact torque requirements.
