What size socket is the oil drain plug?

It depends on the vehicle: most passenger cars use a 13 mm, 14 mm, 15 mm, or 17 mm hex socket, while some trucks/SUVs run 15–19 mm, and several European models use internal hex (6–8 mm) or Torx-style plugs. Because sizes vary by make, model, engine, and oil pan design, the exact answer requires your specific vehicle details; the guidance below explains how to pinpoint the correct socket and includes common sizes by brand.

Why there isn’t a single oil drain plug socket size

Oil drain plugs aren’t standardized across the industry. Automakers choose different plug thread sizes, head styles (external hex vs. internal hex or Torx), materials (steel vs. aluminum vs. plastic), and crush washer types. Even within one brand, different engines and model years can use different plugs and torque specs. That’s why the most reliable approach is to confirm your vehicle’s exact plug type before turning a wrench.

Quick reference: common socket sizes by brand (typical, but verify)

The following list summarizes commonly encountered oil drain plug socket sizes by brand and engine family in North America and Europe. Use it as a starting point; always verify for your exact vehicle and engine code, as exceptions exist.

• Toyota/Lexus: Often 14 mm hex head on many 4-cyl and V6 engines; some newer models may differ. Many use a crush washer.
• Honda/Acura: Frequently 17 mm hex head on most engines; aluminum crush washer commonly required.
• Nissan/Infiniti: Commonly 14 mm hex; verify on V6/V8 applications.
• Mazda: Often 17 mm hex; some older models/engines vary.
• Subaru: Typically 17 mm hex across many models.
• Hyundai/Kia: Frequently 17 mm hex; some models use 14 mm or 19 mm.
• Ford/Lincoln: Commonly 13 mm or 15 mm hex on many EcoBoost and modular engines; some trucks/SUVs use up to 19 mm. A few models use serviceable drain valves or plastic plugs—verify type.
• GM (Chevrolet/GMC/Buick/Cadillac): Often 15 mm hex; some trucks/SUVs 13–15 mm. Performance and diesel variants can differ.
• Chrysler/Dodge/Jeep/Ram: Frequently 13 mm hex (e.g., 3.6L Pentastar, many HEMI pans). Some exceptions exist.
• Volkswagen/Audi: Mix of 19 mm external hex or 6–8 mm internal hex; some pans use a Torx-style or single-use plastic drain plug—always confirm.
• BMW/MINI: Commonly 17 mm external hex on many older steel plugs; later models often use 8 mm internal hex or single-use aluminum plugs—replace as specified.
• Mercedes-Benz: Often 13 mm external hex or 8 mm internal hex; many models are serviced via top-side oil extraction, but the drain plug still exists—check specifics.
• Volvo: Typically 17 mm or 13 mm external hex depending on engine and year.
• Porsche: Often 8 mm internal hex on alloy pans; some models differ.
• Motorcycles (general): Frequently 17 mm external hex, but ranges from 12–19 mm; many require new crush washers.
• SAE equivalents you may encounter: 1/2″, 9/16″, 5/8″, or 3/4″ on some older domestic vehicles and certain aftermarket pans.

These sizes cover the majority of cases, but specific engines, model years, and aftermarket pans can deviate. Confirming your exact plug prevents rounding the head or damaging threads.

How to identify your exact drain plug size

When you don’t have a definitive size, use the steps below to nail it down quickly and safely.

1. Check the owner’s manual or factory service information for the plug size and torque spec.
2. Look up the OEM drain plug part number by VIN on the automaker’s parts site or a reputable catalog; the listing often shows head style/size.
3. Visually inspect the plug: determine if it’s an external hex, internal hex (Allen), or Torx-type; note any “single-use” plastic plugs.
4. Test-fit sockets by hand only: start with likely sizes (13/14/15/17/19 mm; 6/8 mm hex; or SAE equivalents) and choose the tightest 6-point fit.
5. Measure across flats with calipers if accessible; match to the nearest socket size.
6. Confirm crush washer type/size (aluminum, copper, or fiber) and replace it if the manufacturer specifies one.

Following these steps reduces the risk of rounding the plug, overtightening, or creating leaks from a re-used or mismatched washer.

Typical torque specs and washer guidance

Using the right torque and washer is as important as the socket size. The ranges below are typical, but always prioritize the factory spec for your vehicle.

• Common torque range: roughly 25–33 ft-lb (34–45 N·m) for many aluminum pans; some steel pans and larger plugs may specify up to about 30–40 ft-lb (41–54 N·m).
• Crush washers: many Asian brands use aluminum washers that must be replaced each oil change; copper washers are also common. Some European models use single-use plugs with integrated seals.
• Single-use/plastic plugs: torque and replacement are critical; overtightening can crack the plug or pan. Always fit a new plug as specified.

If you cannot find the exact torque, err on the lower end with a new washer, then check for seepage after warm-up and re-torque gently if required.

Technique and troubleshooting

The right technique helps avoid stripped plugs and stuck hardware. Keep these pointers in mind before you start.

• Use a 6-point socket or hex bit (not 12-point) to minimize rounding.
• Break loose with steady pressure; if stuck, apply penetrating oil and allow time, or use brief, controlled impacts with a hand impact driver.
• Support the wrench squarely on the plug; avoid angles that slip off and round the head.
• Replace damaged plugs immediately; consider magnetic plugs only if they match OEM specs.
• Clean threads and mating surfaces; install a new crush washer with the correct orientation.
• Tighten with a torque wrench to spec; recheck for leaks after the first heat cycle.

Taking a few extra minutes with fitment, torque, and sealing saves you from leaks, stripped pans, or costly repairs.

If you share your vehicle details, we can be precise

Tell me your year, make, model, engine size (and VIN if available), and I’ll provide the exact socket size, plug type, washer part number, and torque spec for your specific car.

Summary

There isn’t a universal oil drain plug socket size. Most cars use 13–17 mm external hex, some trucks go up to 19 mm, and many European models use 6–8 mm internal hex or Torx-style plugs. Confirm your exact size via the manual or parts lookup, use a 6-point tool, replace the crush washer or single-use plug as specified, and torque to the factory spec to ensure a leak-free service.

What size ratchet do I need for an oil change?

The correct ratchet size for an oil drain plug depends on the vehicle’s make and model, as there isn’t a universal size. Common metric sizes include 14mm, 15mm, 17mm, or 22mm, while some older or specialized plugs might use SAE sizes. To find the right size, you should check your vehicle’s owner’s manual or a parts store, or you can try different metric or SAE sockets until you find the correct fit. 
How to Find the Right Size

1. Check the Owner’s Manual: Your vehicle’s manual should list the correct size for the drain plug. 
2. Consult a Parts Store: A parts store or an online parts database like RockAuto can provide the specific size for your vehicle. 
3. Try Different Sockets: If you can’t find the size information, have a set of common metric and SAE sockets ready and test them on the drain plug. 
4. Look for a Label: Some manufacturers place the thread size on the head of the plug itself. 

Common Socket Sizes

• Metric: 14mm, 15mm, 17mm, and 22mm are common sizes for European and Japanese vehicles. 
• SAE: Older engines or certain trucks might use standard (SAE) sizes. 

Tips for a Successful Oil Change

• Use the Correct Socket Type: A 6-point socket is generally recommended over a 12-point socket because it fits more securely on the bolt and is less likely to strip it. 
• Get a Drain Plug Socket Set: A magnetic drain plug socket set is a good investment, as it keeps the plug from falling into the pan and helps prevent stripping. 
• Consider a Low-Profile Wrench: For hard-to-reach plugs, a low-profile or offset wrench can provide better access. 

What tool should you use to loosen the oil pan drain plug?

Play. So let’s go ahead open it up really quick. Yeah we’re going to use some tin snips why. Not cuts right through. There. And there we go just a little flexible dongle deal thingy.

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

There isn’t a single socket size for all oil plugs; the correct size depends on your vehicle’s make, model, and year. Common sizes include 17mm and 14mm for many Japanese and European cars, but you might need to check your vehicle’s specifications or visit an auto parts store for help. A 6-point socket is recommended for better grip to avoid stripping the bolt head. 
How to find the right socket size

1. Check your vehicle’s manual: The most reliable way is to consult your car’s owner’s manual to find the specific drain plug size. 
2. Identify the head type: Most drain plugs have a hex-shaped bolt head. 
3. Measure the bolt head: If you have a socket set, try a few sizes to see which one fits snugly. 
4. Consult an auto parts store: Bring the vehicle information to an auto parts store, and they can look up the specific size for you. 
5. Consider common sizes: While not universal, many Japanese and European cars use metric sizes, with 17mm and 14mm being common. 

Tips for changing the oil plug

• Use a 6-point socket: This type of socket is more effective at gripping the bolt and prevents the head from getting rounded off. 
• Use a 3/8-inch drive socket and ratchet: This is a common size for most DIY oil changes. 
• Have a replacement plug ready: If the old drain plug is worn or stripped, you’ll need a new one to replace it. 

What size is the oil drain bolt?

Mild Steel M12 (12 mm) Oil Drain Bolt, Size: 15 mm.