The typical oil drain plug uses a 14mm socket, but sizes vary by make and model. Always verify the exact size for your vehicle before loosening the plug.
Oil drain plugs come in several sizes, and some engines use non-standard heads or hex/Allen fittings. This article outlines the common sizes you’re likely to encounter and how to determine the correct one for your car.
Common socket sizes for oil drain plugs
The following sizes cover the most frequently observed drain-plug heads across modern cars. Use this as a starting point, then verify on your vehicle to avoid damage.
- 14mm: The most common size for many cars, including many Japanese, American, and some European makes.
- 12mm: Found on some older or smaller cars and certain manufacturers.
- 13mm: Used by a minority of models from various makes.
- 15mm: Appears on some European makes and certain models.
- 17mm: Used on some larger engines, trucks, or specific European vehicles.
- Other sizes: Rare cases may use 19mm or non-metric sizes; always verify.
Note: Some drain plugs have a hex/Allen head or require a special bit rather than a standard hex socket. If your plug head is not a classic socket drive, identify whether it uses a hex or Allen head and choose the corresponding tool.
In short, start with the most common size (14mm) and confirm with your manual or by inspecting the plug to avoid damage from an ill-fitting tool.
How to determine your exact size
Before attempting to drain your oil, determine the correct size with these steps. The following method helps you avoid stripping the plug or using an ill-fitting tool.
- Consult the owner's or service manual for the recommended drain-plug size for your engine.
- Inspect the drain-plug head; sometimes the size is stamped on the head or the washer. If visible, read the marking.
- Use a metric socket set and try sizes from 12mm to 17mm, starting with 14mm, ensuring the socket seat fits snugly without wobble.
- If the head is hex/Allen-style, use the appropriate hex/Allen bit (e.g., 6mm or 8mm) or a compatible wrench designed for that head.
- If unsure or the plug is damaged, consider replacing the drain plug with a new one of the correct size and torque specification, or seek professional assistance.
Using the correct size ensures a proper seal and helps prevent leaks after an oil change.
Summary
For most gasoline-powered passenger cars, the oil drain plug usually requires a 14mm socket, but sizes can range from 12mm to 17mm depending on the make and model. Check the manual or plug markings, keep a small set of metric sockets handy, and be aware that some plugs use hex/Allen heads or non-standard fittings. When in doubt, consult a professional to avoid damage.
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Where is the oil drain plug on a Subaru Forester?
It. And once you've loosened it just let everything drain. And don't don't forget to replace the crush washer.
What is bigger, 1/4 or 3/8 socket?
The 1/4-inch drive socket is ideal for low-torque applications such as electrical work or in close-quarter automotive dashboards. A 3/8-in. drive socket is 25 percent stronger, but also . 022 inches larger in diameter than the 1/4-inch drive socket.
What size socket do I need for an oil drain plug?
What size socket do I need for my car's oil drain plug? Most cars use oil drain plugs between 13mm and 17mm, depending on the brand. For example, Toyota and Honda typically use 14mm or 17mm, while Ford often uses 13mm or 15mm.