What size socket for Subaru Outback oil plug?

The drain plug on most Subaru Outback models uses a 14mm socket.

Socket size by engine family

Here is a concise guide for common Outback engines. This helps you choose the right tool without guesswork. Always confirm on your specific vehicle if possible.

• Most EJ-, FA-, and FB-series engines used in Subaru Outbacks since the late 1990s employ a 14mm oil drain plug head, meaning a 14mm socket (usually a 6‑point) fits securely.

In practice, the 14mm size covers the vast majority of Outback models across generations. If you have a rare variant or a nonstandard plug, verify visually or check your owner's manual to be certain.

How to confirm the exact size for your car

To avoid stripping or cross-threading, verify the plug head before applying force. Use these steps:

1. Inspect the drain plug head for a 14mm hex; if the head looks worn, replace the plug before removal.


2. Consult your model year’s owner's manual or service manual to confirm the specified tool size.


3. If the plug head is unreadable, measure across the flats with a caliper or compare with a known 14mm tool.


4. Choose a snug-fitting socket, preferably a 6-point deep socket, to minimize rounding.


5. Reinstall with the recommended torque (typically around 20–25 ft-lbs, or about 27–34 N·m; verify exact spec in the manual).

With the correct size confirmed, you can perform an oil change safely and avoid damaging the drain plug or oil pan.

Additional considerations

Always use a new washer if your model requires one, and ensure the drain plug and threads are undamaged. After draining, double-check for leaks once the oil is refilled.

Summary

For most Subaru Outback models, the oil drain plug requires a 14mm socket. This size applies across the common EJ-, FA-, and FB-series engines used in Outbacks from the late 1990s to today. When in doubt, verify with your specific model year’s manual or visually confirm the plug head before proceeding, and follow the recommended torque to ensure a proper seal.

What size socket for oil drain plug subaru outback?

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What size socket do I need to remove the oil drain plug?

The correct socket size for an oil plug depends on your car's make and model, as there is no single universal size. Common metric sizes include 14mm, 15mm, 17mm, and 19mm, while some older vehicles may use SAE sizes like 3/8" or 1/2". Always inspect the plug to confirm the size, as using the wrong socket can damage the bolt head. 
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How to find the right size

• Check your owner's manual: This is the most reliable way to find the correct size for your specific vehicle. 
• Inspect the plug: Visually examine the drain plug to determine its size. You can also measure it with a caliper if needed. 
• Try common sizes: If you can't find your manual, start with common metric sizes like 14mm, 15mm, 17mm, or 19mm. 
• Use the right socket type: A 6-point socket is recommended over a 12-point socket to prevent stripping the bolt head. 

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Important tips

• Use the correct socket: A well-fitting socket is crucial to avoid rounding the bolt head. 
• Tighten properly: Do not overtighten the drain plug, as this can strip the threads. Tighten it to the manufacturer's specifications, or just snug it up if you don't have a torque wrench. 
• Replace the crush washer: It is a good practice to replace the crush washer on the drain plug to ensure a proper seal. 

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 oil drain plug on a 2018 Subaru Outback?

The 2018 Subaru Outback oil drain plug is typically a 17mm head size, with an M16x1.5 thread size. Some sources may also indicate a 14mm head size, but this can vary and may lead to stripped threads, making the 17mm plug a common replacement. It's best to use the correct Part Number 807016210 or confirm the size before purchasing a replacement plug.
 
Key details

• Head size: 17mm, although some models may have a 14mm plug.
• Thread size: M16x1.5.
• OEM Part Number: 807016210.
• Important consideration: Some drain plugs may have a 14mm head, but using a 17mm plug is often recommended as a replacement to avoid stripping.