What size is the oil drain plug on a 2013 Subaru Outback?

The drain plug uses a 14mm hex head and typically threads into the oil pan as M14 x 1.5.

The 2013 Subaru Outback came with a 2.5-liter four-cylinder engine as the common setup, with a V6 option in higher trims. Across these configurations, the oil drain plug is standardized to a 14mm head size, with a metric thread that is commonly M14 x 1.5. Always confirm with the specific engine code for your vehicle (subtle variations can exist between EJ-series and newer FB/FA-series engines) and replace the crush washer each time you drain the oil. When in doubt, consult the official service manual or a Subaru dealer for the exact spec on your VIN.

Plug size specifics

The following quick reference highlights the essential sizing you’ll need when performing an oil change on a 2013 Outback.

• Head size: 14 mm across flats (requires a 14 mm socket or wrench).


• Thread size: commonly M14 x 1.5 for the 2.5L and similar Subaru engines from that era.


• Washer: replace the copper or aluminum crush washer with a new one during reinstallation.

In practice, these measurements cover the vast majority of 2013 Outback models. If your vehicle has an unusual engine variant (for example, a rare early model with a different oil pan design), verify the spec in the service documentation or by inspecting the current plug and its threads.

How to replace the drain plug: step-by-step

Below is a clear procedure to safely remove, replace, and reseal the drain plug. A quick pre-check helps prevent leaks and spills.

1. Park on a flat surface, engine off, and cool. Place a drain pan beneath the oil pan.


2. Using a 14 mm socket or wrench, loosen the drain plug counterclockwise until it unscrews fully; let the oil drain completely.


3. Inspect the drain plug and threads for damage. Remove the old crush washer if present.


4. Install a new crush washer on the drain plug threads and hand-tighten the plug back into the oil pan.


5. Finish tightening with a torque wrench to the manufacturer’s specification for your engine variant (refer to the service manual for the exact value).


6. Replenish engine oil to the proper level, run the engine briefly, and check for leaks around the drain plug.

Concluding: Proper torque and a fresh crush washer are essential to preventing leaks. Dispose of used oil according to local regulations and recycle the oil filter as required.

Notes and where to verify exact specifications

Because Subaru offered multiple engine options in the 2013 Outback (and regional variations may apply), it’s wise to verify the exact drain plug specification for your specific VIN. If you have an EJ25-based configuration or a later FB/FA engine, consult the official Subaru service manual or contact a dealership to confirm the correct thread size and torque. Using the correct hardware and torque helps ensure a reliable seal and long oil-change intervals.

Summary

For a 2013 Subaru Outback, the oil drain plug typically requires a 14mm wrench and uses an M14 x 1.5 thread, with a new crush washer recommended on reinstall. Always verify with your engine code in the service manual and follow the OEM torque specification to ensure a proper seal and leak-free operation.

What size socket is the oil drain plug?

There is no single socket size for all oil drain plugs, as it varies by vehicle, but common metric sizes are 13mm, 14mm, 15mm, 17mm, and 19mm. To find the correct size, check your vehicle's owner's manual or a set of assorted metric sockets if unsure. 
This video shows how to use different tools to remove an oil drain plug: 1mOn The WorkbenchYouTube · Nov 1, 2024
Common sizes

• Metric: The most common sizes for passenger vehicles are between 13mm and 17mm. 
• SAE: Some older or specialty vehicles may use SAE (inch) sizes, which are often fractional (e.g., 3/8" or 1/2"). 
• Specialty: Some plugs might have a square opening, a hex (Allen/Allen key), or a Torx (star) shape instead of a traditional bolt head. 

How to find the right size

1. Check your owner's manual: This is the most reliable source for your specific car. 
2. Use a socket set: Start with common sizes like 13mm, 14mm, 15mm, and 17mm. A 6-point socket is best as it grips the bolt head more securely. 
3. Visit an auto parts store: You can tell them your vehicle's make and model, and they can look up the correct size. 
4. Try a universal set: If you frequently change the oil, consider buying a specialized oil drain plug socket set that includes common metric and SAE sizes. 

This video explains the importance of using the correct tool to remove an oil drain plug: 1mYour Home GarageYouTube · Nov 24, 2022

What size socket for oil drain plug subaru outback?

And our clean 020. Oil we're going to take a little bit of this put it on the oil filter i'm going to take a glove finger and spread it around the seal. Now we can get this in. Position.

What size is a Subaru oil drain plug?

The Subaru oil drain plug size can vary, but common sizes include a 17mm head with an M16-1.50 thread or a 14mm head with a 16x17 thread, depending on the vehicle's year and model. Older models often use the 17mm head, while newer models are more likely to have the 14mm or 16x17 size. It's best to check your specific Subaru model's manual or measure the plug to confirm the exact size you need.
 

• Older Models: Many older Subaru models use a 17mm head with an M16-1.50 thread. 
• Newer Models: A 14mm head or a 16x17 thread (which may correspond to a 14mm head) is common on many newer Subarus. 
• Verification: To be certain, you should either check your owner's manual or measure the existing drain plug's head size and thread pitch before purchasing a replacement. 

What size is the drain plug on a 2013 Subaru Outback?

16X17
Shop 2013 Subaru Outback Engine Oil Pan Drain Plug. Plug 16X17.