What Size Socket Do You Need to Remove an Oil Drain Plug?

There isn’t a single universal size: most passenger vehicles use a 13–19 mm socket for the oil drain plug, with 14 mm, 15 mm, and 17 mm being the most common. Some vehicles use an internal hex (Allen) — often 8 mm or 10 mm — a Torx, or even a 3/8-inch square drive. Always confirm in your owner’s manual or by test-fitting a 6‑point socket.

The most common sizes, by brand and type

While sizes vary by engine and model year, technicians see consistent patterns across brands. Use the following as a quick orientation before you check your specific vehicle.

• Toyota/Lexus: Typically 14 mm external hex on many cars and crossovers; trucks/SUVs commonly 14 mm as well.
• Honda/Acura: Commonly 17 mm external hex.
• Nissan/Infiniti: Frequently 14 mm external hex.
• Hyundai/Kia: Often 17 mm external hex (some 14 mm).
• Subaru: Commonly 17 mm external hex.
• Mazda: Frequently 17 mm external hex (some models 14 mm).
• Volkswagen/Audi: Often 19 mm external hex or 8 mm internal hex (Allen); some are one-time-use aluminum plugs.
• BMW/MINI: Many models use 17 mm external hex; some later engines use 8 mm internal hex.
• Mercedes‑Benz: Commonly 13–14 mm external hex; some engines use 8 mm internal hex or are serviced by top-side extraction.
• Ford/Lincoln: 13 mm or 15 mm external hex on many metal plugs; some newer models use a quarter‑turn plastic plug requiring a special tool or 3/8-inch square drive.
• GM (Chevrolet/GMC/Buick/Cadillac): Frequently 15 mm external hex (some 13 mm).
• Chrysler/Dodge/Jeep/Ram: Often 13 mm or 15 mm external hex; older models may accept a 3/8-inch square drive.
• Volvo: Commonly 17 mm external hex.
• Porsche and some European diesels: Frequently 8 mm or 10 mm internal hex.

Treat these as typical, not definitive. Mid-cycle updates, different engines within a lineup, and aftermarket plugs can change the size on any given vehicle.

How to quickly find your exact socket size

If you don’t have the spec handy, these steps help you identify the correct tool without rounding the plug.

1. Check the owner’s manual or official service information; many list the plug type and torque.
2. Visually identify the head: external hex (standard bolt), internal hex (Allen), Torx, plastic quarter-turn, or 3/8-inch square recess.
3. Start with a 6‑point metric socket set (13–19 mm). Test-fit by hand; the correct socket seats fully with no wiggle.
4. If it’s an internal hex, try 6 mm, 8 mm, then 10 mm Allen bits. For Torx, identify the size by fit (commonly T45–T55 if used).
5. Avoid 12‑point sockets on stubborn plugs; a snug 6‑point reduces the chance of rounding.
6. If the plug is plastic or marked “one-time use,” follow the specific procedure or tool noted by the manufacturer.

When in doubt, measure the head with calipers or take a clear photo and compare to known sizes. A precise fit matters more than guessing a “usual” size.

Tools and setup that make the job safer

Having the right tools will protect the plug and the oil pan, especially on aluminum pans that can strip easily.

• 6‑point metric sockets: 13, 14, 15, 17, 19 mm; optional SAE: 1/2″, 9/16″, 5/8″.
• Allen/hex bits: 6, 8, 10 mm; Torx bits if applicable.
• 3/8-inch drive ratchet; short extension; breaker bar for stuck plugs.
• Torque wrench capable of 15–40 ft‑lb (20–55 Nm).
• New crush washer/gasket (copper/aluminum/nylon) matched to your plug.
• Drain pan, rags, nitrile gloves, and eye protection.

A correct-size 6‑point socket and a fresh washer do more to prevent leaks and damage than any sealant or overtightening.

Typical torque specs and cautions

Most oil drain plugs tighten between 18–33 ft‑lb (25–45 Nm), but follow the spec for your engine. Common examples: Honda/Acura ~29 ft‑lb (39 Nm); Toyota ~27–30 ft‑lb (37–41 Nm); Subaru ~31 ft‑lb (42 Nm); VW/Audi ~22–26 ft‑lb (30–35 Nm); BMW often ~18–25 ft‑lb (25–34 Nm), especially with aluminum pans. Always replace the crush washer if the design calls for one, thread the plug by hand first to avoid cross‑threading, and never use an impact on the drain plug.

Exceptions and special plugs

Some late-model Fords and other brands use plastic, quarter‑turn, or single-use plugs with unique removal tools and lower torque or “click” mechanisms. Certain European models specify one-time-use aluminum plugs. For these, use the exact tool and replacement parts specified; substituting a metal aftermarket plug can void warranties or damage pans.

Quick reference by frequency

If you’re building a minimal kit or standing under the car, these sizes cover the majority of passenger vehicles.

• Most common: 14 mm, 15 mm, 17 mm external hex.
• Also seen: 13 mm and 19 mm external hex.
• Less common but important: 8 mm or 10 mm internal hex (Allen); 3/8-inch square drive; Torx on select models.

Carrying 13–19 mm sockets plus 8/10 mm hex bits will let you remove the drain plug on the vast majority of modern cars and light trucks.

Summary

There is no single oil drain plug socket size. The majority use 14 mm, 15 mm, or 17 mm 6‑point sockets; some require 13 mm or 19 mm, and others use an internal 8–10 mm hex, Torx, or a special plastic plug tool. Confirm your vehicle’s spec, use a snug 6‑point socket, replace the crush washer, and torque to the manufacturer’s value to avoid leaks and stripped threads.

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