What size is a Subaru drain plug?

Most Subaru engine oil drain plugs use a 14 mm hex head and M14x1.5 thread. However, plug sizes can vary by model and by whether you’re draining engine oil, transmission fluid, or another component, so verify for your exact vehicle.

Common engine oil drain plug size

The engine oil pan drain plug you’ll most often encounter on Subarus is a 14 mm hex head with M14x1.5 thread.

• Engine oil drain plug: hex head size 14 mm; thread size M14x1.5.

Note: Some models or years may differ; consult your owner’s manual or service manual to confirm for your specific vehicle.

Model and year variations

While 14 mm/ M14x1.5 is common, Subaru engines have used other configurations across generations. Always verify with documentation before draining.

EJ and FA/FB engine families

In many EJ and FA/FB engine blocks, the engine oil drain plug uses a 14 mm hex head; threads commonly M14x1.5. Some variations exist, so check the exact part number for your model/year.

Other drain plugs (transmission, differential)

Transmission, transfer case, and differential drain plugs vary by transmission type and model year. Use the owner's manual or VIN-specific service data to determine the correct size and head type for those plugs.

How to verify your specific Subaru drain plug size

To avoid damage, confirm the correct plug size for your exact model and year using these steps. If you’re not confident, consult a Subaru dealer or qualified technician.

1. Check the owner’s manual or service manual for your model/year for the specified drain plug size and torque values.


2. Inspect the existing drain plug: measure the head with a torque wrench or socket and identify the size that fits snugly (14 mm is common for engine oil plugs).


3. If you can’t confirm, provide your VIN to a dealer or look up the part number in Subaru’s service data to ensure you buy the correct plug.


4. When replacing, use the proper gasket/washer and apply the recommended torque to avoid leaks or strip.

Bottom line: Using the right size protects against leaks and damage.

Summary

For most Subaru engines, the engine oil drain plug is a 14 mm hex head with M14x1.5 thread. However, sizes vary by model year and by the type of drain. Always verify with the manual or dealer for your specific vehicle to ensure a proper fit and seal.

What size socket for Subaru oil drain plug?

The common socket sizes for a Subaru oil drain plug are 17mm or 14mm, depending on the model year and engine type. Some older or specific models might also use a 13mm socket, but it's less common for the oil drain plug. It's best to confirm the exact size for your vehicle before starting. 

• 17mm: Commonly used on many older or specific models, such as the 2.5L engines on some Outbacks and Foresters. 
• 14mm: Frequently used on newer models, including some Crosstreks and newer 2.5L Outbacks. 
• 13mm: This size is less common for the oil drain plug but is sometimes cited for various Subaru models, and is more often used for differential drain plugs. 
• Other sizes: Some models may have other sizes or use a non-hex head, so it's crucial to check the correct size for your specific car before performing an oil change. 

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 is the oil drain plug on a 2018 Subaru?

M16-1.5" Thread Size.

What size is the oil pan plug on a Subaru?

The Subaru oil drain plug size varies by engine, but the most common sizes are 17mm for larger engines like the 3.6L or 2.4L turbo, and 14mm for smaller 4-cylinder engines like the 2.5L or 2.0L. You should verify the correct size for your specific vehicle's engine by checking your owner's manual or consulting a parts diagram, as using the wrong size can damage the plug or oil pan.
 
Common sizes

• 14mm: This size is common for many 4-cylinder engines, such as the 2.5L in many Foresters and Outbacks, and the 2.0L in the Impreza and Crosstrek. 
• 17mm: This size is often found on larger engines, such as the 3.6L in some Outbacks and other Subaru models, as well as the 2.4L turbocharged engines in newer models. 

Important considerations

• Check your specific vehicle: The size can vary between model years and engine types, so always confirm the correct size for your specific car before purchasing a new plug or performing an oil change. 
• Use the right tool: Use a 6-point socket for better grip and to avoid rounding off the plug's head. 
• Replace the washer: It is highly recommended to replace the crush washer on the drain plug with a new one each time you perform an oil change to ensure a proper seal.