What size socket do I need to drain my oil?

Most passenger cars use a 14 mm or 17 mm socket to remove the oil drain plug, with 19 mm appearing on a few trucks; confirm by checking your owner's manual or measuring the plug.

Because plug head sizes vary by make, model, and engine, the exact size you need depends on your vehicle. Locate the drain plug under the oil pan, identify the head type, and try sockets from your toolkit to find the right size without stripping the head. If you're unsure, consult the manual or a shop.

Common drain plug socket sizes

Here are the sizes you are most likely to encounter across different cars. Use this as a quick reference to start your preparation for an oil change.

• 14 mm: by far the most common on European and many Asian cars.


• 17 mm: widely used on Japanese, American domestics, and several European models.


• 19 mm: less common, but seen on some trucks and larger engines.

In addition to hex-socket drives, some drain plugs use alternate head types that require specific tools beyond a standard hex socket. Knowing the head type before you shop helps you avoid wasted trips or damaged hardware.

Other drive types you might encounter

Not every oil pan uses a standard hex socket. Some manufacturers opt for different drives, which can change the tool you need.

• Allen (hex) drives: may require a 6 mm or 8 mm Allen key or corresponding Allen socket.


• Torx drives: sometimes use a Torx T40, T45, or similar size.


• Specialty or square-head plugs: occasionally require a dedicated drain-plug tool.

Identify the drive type by inspecting the plug head; using the wrong tool can strip the head or ruin the plug.

How to determine the exact size for your car

To confirm the correct size for your vehicle, follow these steps:

1. Consult the owner's or service manual for the recommended drain plug size and drive type.


2. Locate the drain plug on the oil pan and visually inspect the head to identify whether it is hex, Allen, Torx, or another drive.


3. Begin with a common size (often 14 mm or 17 mm) and test carefully to avoid stripping. If it doesn’t fit, try the next size up or a different drive as indicated by the plug head.


4. If you can’t determine the correct size or the head is damaged, seek help from a professional to prevent thread or pan damage.

Following these steps helps ensure you use the correct tool and avoid damaging the drain plug, pan, or threads.

Tools and safety tips for a smooth oil change

Having the right tools on hand makes the job easier and safer. Here is a practical checklist before you start:

• Socket set with 14 mm, 17 mm, and optionally 19 mm sockets; include a deep or shallow variant as needed.


• Breaker bar for stubborn plugs, if necessary.


• Oil drain pan, rags, and gloves for cleanliness and safety.


• New drain plug washer or gasket if your vehicle requires it.


• Torque wrench to re-tighten to the manufacturer’s specification after draining and refilling the oil.

Using the appropriate tools helps prevent stripping and ensures a proper seal when you refill the engine.

Summary

There isn’t a single universal socket size for draining oil. The typical sizes you’ll encounter are 14 mm and 17 mm, with 19 mm appearing on some vehicles. Always verify with the owner’s manual or by inspecting the drain plug head, and be prepared for alternate drives like Allen or Torx on a subset of models. Armed with the right socket and a careful approach, you can complete an oil change without damaging the plug or pan.

What socket do you need to change your oil?

Socket Wrench and Drain Plug Socket
You'll need a socket wrench to remove the oil drain plug. The size of the socket depends on your car, so check your owner's manual to find out what you need. A drain plug socket is usually included in a basic socket set.

Do I need a ratchet for oil change?

All you really need is a jack and depending on how the drain plug is setup a box wrench or socket plus rachet. Filters shouldn't need a wrench that is if the person before didn't tighten it down with the hand of God.

What size ratchet for car maintenance?

1/2 inch - 1/2" sockets are generally used for nuts and bolts from around 10mm and up. A 1/2" drive socket can apply enough force to undo all nuts on a car. There are also 3/4" and 1" ratchets but these are used on trucks, tanks and industrial machinery.

What size socket for an 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. 
You can watch this video to learn how to change the oil in a Honda CR-V, including removing the drain plug: 1m1A Auto: Repair Tips & Secrets Only Mechanics KnowYouTube · Aug 13, 2018
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. 

This video demonstrates how to use a drain plug removal tool with a magnetic feature: 52sScavenger1320YouTube · Feb 23, 2024
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.