What size socket do I need for my oil plug?

Most passenger vehicles use a 13–17 mm six-point socket for the engine oil drain plug; some trucks and older domestic models may use 15–19 mm or SAE sizes like 1/2″ or 5/8″. A few engines use internal hex (Allen) or Torx fittings. Because sizes vary by engine and model year, verify in your owner’s manual or measure the plug before starting.

Quick reference: common sizes you’re likely to encounter

The list below highlights the socket sizes most frequently used for oil drain plugs, along with typical examples. Use it as a starting point, then confirm your exact size by checking your manual or measuring the plug on your specific engine.

• 13 mm — Common on some Ford/GM/Chrysler engines and many domestics.
• 14 mm — Very common on Toyota, Honda, Mazda, Nissan, and many Asian brands.
• 15 mm — Widely used on GM and Ford trucks/SUVs and various domestics.
• 17 mm — Frequent on Subaru, Hyundai/Kia, and some European models.
• 19 mm — Found on some older VW/Audi, certain trucks, and larger plugs.
• SAE 1/2″, 9/16″, 5/8″ — Seen on older or domestic applications (especially trucks and older V8s).
• Internal hex (Allen) 6 mm, 8 mm, 10 mm — Common on some BMW, Mercedes-Benz, and VW/Audi oil pans.
• Torx (e.g., T45/T50) or quarter-turn plastic plug — Used on select late-model Fords and some European applications; may require a special tool rather than a socket.

While these sizes cover most cases, the exact plug on your vehicle can vary by engine option and model year. Always confirm fit with a six-point socket to avoid rounding the plug.

How to find the exact socket size for your vehicle

If you don’t know the size, follow these steps to confirm it safely and accurately before you loosen the plug.

1. Check the owner’s manual or service manual: Many list the drain plug type and torque spec, which indirectly confirms the size.
2. Look up the drain plug by VIN or engine: Parts sites list the exact plug and often the head type/size.
3. Measure across flats (AF): With the engine off, use calipers or a small adjustable wrench to measure the hex flats; match that measurement to the socket size.
4. Test a six-point socket gently: The correct socket will seat fully with minimal play; don’t force a tight or sloppy fit.
5. Confirm torque spec: Typical ranges are about 22–30 ft-lb (30–40 Nm) for M12 plugs and 25–35 ft-lb (34–47 Nm) for M14, but aluminum pans or plastic plugs can require less—use the spec for your engine.

Taking a moment to verify the size and torque spec helps prevent rounded bolts, stripped threads, and leaks.

Important cautions and best practices

These tips reduce the risk of damage and help ensure a clean, leak-free oil change.

• Use a six-point socket: It grips the plug better than a 12-point and reduces rounding.
• Replace the crush washer or gasket: Many Toyota/Honda/Subaru and others require a new washer each change to seal properly.
• Don’t over-tighten: Follow the specified torque, especially with aluminum pans or plastic/quarter-turn plugs.
• Know your plug type: Some late-model Fords use a plastic drain plug that twists out (no socket); others use internal hex or Torx.
• Don’t confuse the oil drain plug with the oil filter cap: Filter caps often need a large cap wrench (e.g., 64 mm for many Toyota/Lexus) and are different from the drain plug.
• If the plug is rounded, use a bolt extractor socket: Avoid vice grips unless it’s a last resort.
• Work safely: Use proper jack stands or ramps and wear gloves; hot oil can burn.

Following these practices helps protect the pan threads and ensures the plug seals correctly after reinstallation.

Examples by popular models (typical, but verify)

These are common socket sizes seen in the field; your exact year/engine may differ, so confirm before loosening the plug.

• Toyota Camry/Corolla/RAV4: 14 mm hex (crush washer required on many models).
• Honda Civic/Accord/CR‑V: 14 mm hex (new aluminum washer recommended).
• Subaru Forester/Outback/Impreza: 17 mm hex (replace crush washer).
• Mazda 3/6/CX‑5: 14 mm hex (new washer often specified).
• Nissan Altima/Rogue: 14 mm hex on many engines.
• Hyundai/Kia (various): Commonly 17 mm hex.
• Ford F‑150: Often 13 mm or 15 mm hex depending on engine/year; some late models use a plastic, quarter‑turn plug (no socket).
• Chevy Silverado/Sierra: Frequently 13 mm or 15 mm hex depending on engine.
• VW/Audi: 19 mm hex on some older models; many modern engines use 6–8 mm internal hex or a special drain system.
• BMW: Often 17 mm hex or 8 mm internal hex; torque is typically modest—verify for aluminum pans.
• Mercedes-Benz: Mix of 13 mm hex and 8 mm internal hex depending on engine.
• Jeep/Dodge/Ram: Commonly 13 mm or 15 mm hex on many gasoline engines.

Use these examples as guidance only; always check the exact engine and production year to be certain.

If you’re unsure

Bring a metric set from 10–19 mm and a few SAE sockets (1/2″, 9/16″, 5/8″) to the job, or share your year/make/model/engine and I can identify the precise size and torque spec for your vehicle.

Summary

In most cases, a six-point metric socket between 13 and 17 mm fits the oil drain plug; some vehicles use 15–19 mm or SAE sizes, and a minority use internal hex or Torx. Confirm by checking your manual or measuring the plug, use a six-point socket and the correct torque, and replace the crush washer to prevent leaks.

What size socket do you need for oil?

Ratchet and Socket Set
Get a set that includes some metric and SAE sizes, and if you’re starting out, a 3/8” drive should do just fine. Ratchets and sockets also come in 1/4, 1/2″, 3/4″, and 1” drives. Many medium sized kits will include ratchets and sockets in 3/8” and 1/2″ drive.

What size is a standard oil drain plug?

There is no single “standard size” for an oil drain plug, as sizes vary by vehicle make and model. To find the correct size, you need to check your vehicle’s owner’s manual or measure your existing plug’s thread diameter (e.g., M12, M14) and the required wrench size for the head (e.g., 15mm, 17mm).
 
How to Determine Your Drain Plug Size

1. Check Your Owner’s Manual: This is the best first step to find the correct size specified for your vehicle. 
2. Measure Your Existing Plug:
   • Thread Diameter: Measure the widest part of the plug’s threads to get the metric (M) or standard (SAE) diameter (e.g., M12 means a 12mm thread diameter). 
   • Head Size: The head size (e.g., 17mm) is the measurement needed for the wrench or socket you’ll use to remove and install the plug. 
3. Use a Vehicle-Specific Parts Catalog: Websites for auto parts stores or manufacturers like Dorman Products and NAPA Auto Parts have tools to help you find the right drain plug by entering your vehicle’s year, make, and model. 

Common Size Examples
While not standard, here are some examples of common sizes: 

• Metric: M12 x 1.5, M12 x 1.75, M14 x 1.50.
• SAE (Imperial): 1/2-20.

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 to remove oil plug?

The most common socket sizes for an oil drain plug are 14mm, 15mm, 17mm, and 19mm, but the specific size varies by vehicle make and model. To find the correct size, you’ll need to check your vehicle’s owner’s manual or identify the plug’s head size directly. Using a 6-point socket of the correct size is essential to prevent rounding off the plug.
 
This video demonstrates how to remove a car’s oil drain plug and the importance of using the right tools: 57sJimthecarguyYouTube · Nov 17, 2014
How to find the right size socket:

1. Check your vehicle’s manual: Opens in new tabThe owner’s manual is the best resource for the exact specifications for your car’s oil plug. 
2. Visually inspect the drain plug: Opens in new tabLook at the hexagonal head of the drain plug to determine its size. You can also measure it with calipers or a ruler. 
3. Try common sizes: Opens in new tabIf you don’t have the manual, you can try a set of common metric sizes, which include 14mm, 15mm, 17mm, and 19mm. 

Important tips:

• Use a 6-point socket: These provide the best grip and are less likely to strip the plug than a 12-point socket. 
• Replace the washer: It’s a good practice to replace the drain plug washer each time you change the oil to prevent leaks. 
• Do not overtighten: After installing the new plug, snug it up but avoid overtightening, as this can damage the oil pan.