What size wrench is the oil drain plug on a 2015 Subaru Forester?
For the 2015 Subaru Forester, the OEM oil drain plug uses a 14 mm hex head. A 14 mm socket or wrench will normally fit. Some aftermarket plugs or engine variants may differ, so verify the head if it doesn’t fit correctly.
Factory standard and how to identify the plug size
The Forester’s oil pan drain plug is designed for a 14 mm hex head. To identify it, try a 14 mm socket or box-end wrench; it should seat snugly without slipping. If the head won’t engage properly, recheck that you have the correct plug for your exact model year and engine variant.
Tools you'll need
To change the oil and work with the drain plug, you’ll typically need a 14 mm socket (or open-end wrench), a ratchet, an oil drain pan, safety gloves, and a torque wrench if you want to tighten to a precise specification.
Considerations for aftermarket plugs and maintenance tips
Some aftermarket drain plugs may use different head sizes. If you’ve installed an aftermarket plug, test several sizes carefully and refer to the plug manufacturer’s instructions. When finishing the job, reseal the drain plug with the proper washer or gasket and tighten to the vehicle’s recommended torque, as specified in the owner’s manual.
Summary
The standard wrench size for the oil drain plug on a 2015 Subaru Forester is 14 mm. Always confirm with your manual or a dealership if you’re unsure, especially if an aftermarket drain plug is present. Proper technique and torque help prevent leaks and spills during an oil change.
