What size socket do you need for oil?

You’ll need the socket that fits your specific vehicle’s oil drain plug or oil-filter housing; for most cars, drain plugs use 13–19 mm sockets (often 14, 15, or 17 mm), while filter housings commonly take 24–36 mm sockets or a cup-style wrench such as 64 mm/14-flute. Because sizes vary by make, model, and engine, verify in the owner’s manual or measure before you wrench.

Why there isn’t a single “oil socket” size

Oil changes involve at least two fasteners: the oil pan drain plug and the oil filter (either a spin‑on canister or a cartridge-style housing with a hex head). Automakers use different fastener designs and sizes across models and years, so there’s no universal socket. Knowing which system your car uses determines the tool you need.

Common oil drain plug socket sizes

The drain plug is the bolt at the bottom of the oil pan. Most are standard hex-head bolts sized in metric, but some use internal hex (Allen) or Torx. The list below highlights sizes you’re most likely to encounter.

• Metric hex-head: 13 mm, 14 mm, 15 mm, 17 mm, 19 mm (21 mm on some trucks/SUVs)
• SAE hex-head: 1/2″, 9/16″, 5/8″, 3/4″ (on older or domestic applications)
• Internal hex (Allen): commonly 6 mm or 8 mm on some European models
• Torx (internal): often T45 or T50 on select European applications

Most Japanese brands commonly use 14 mm or 17 mm; many U.S. models use 15 mm; European cars frequently mix 13 mm hex, 8 mm Allen, or Torx. Always confirm before applying force to avoid rounding the fastener or stripping the pan.

Common oil filter cap and cup‑wrench sizes

Cartridge-style filter housings (hex on top of plastic/metal cap)

Cartridge filters sit in a reusable housing with a large hex molded into the cap. You’ll need a deep socket on the cap’s hex. These are common sizes and where you might see them.

• 24 mm: common on many VW/Audi four-cylinders and some European engines
• 27 mm: often seen on Toyota/Lexus and some Chrysler/Jeep applications
• 32 mm: used on various GM Ecotec engines and some European models
• 36 mm: widespread on BMW and Mercedes-Benz cartridge housings

Even within a brand, engines differ. If your cap is plastic, use a correctly sized six‑point socket and moderate torque to prevent cracking; always replace the O‑ring supplied with the new filter.

Spin‑on (can) filters using cup-style end-cap wrenches

Spin-on filters are removed with a cap “cup” that matches the can’s diameter and flute count. The sizes below are the most common across North American and Asian brands.

• 64 mm, 14‑flute: very common for Toyota/Lexus/Scion spin‑on filters
• 65 mm, 14‑flute: common for Honda and Subaru spin‑on filters
• 74 mm, 14‑flute: fits many Ford (e.g., FL‑910S), Hyundai/Kia, and small aftermarket filters
• 76 mm, 14‑flute: common for larger Ford filters (e.g., FL‑820S)
• 93 mm, 15‑flute: used on many GM full‑size truck/SUV filters (e.g., PF63 family)

If you don’t have the exact cup, a quality strap-style wrench can work, but avoid crushing the filter. For cartridge housings that look like big round “caps,” use the dedicated cap tool, not a strap.

How to find your exact size

Because sizes vary by engine, these quick checks will help you identify the right tool before you start draining oil.

1. Check the owner’s manual or service manual for drain plug and filter tool specs.
2. Inspect the fastener: hex head (external), internal hex (Allen), or Torx; count filter flutes if using a cup wrench.
3. Measure across the flats with calipers or a ruler if the size isn’t listed.
4. Use a six‑point socket to test fit snugly; avoid loose 12‑point sockets on stubborn plugs.
5. Note torque specs: many drain plugs tighten around 25–35 lb‑ft (34–47 N·m), but always follow the manufacturer’s spec.
6. Replace crush washers or sealing rings where specified to prevent leaks.

Taking a minute to identify the fastener and confirm torque saves time and prevents costly damage like stripped pans or cracked plastic caps.

Quick brand examples (typical, not universal)

The examples below reflect common setups to give you a starting point; always verify for your exact engine and model year.

• Honda: 17 mm drain plug; 65 mm/14‑flute cup for most spin‑on filters
• Toyota/Lexus: 14 mm drain plug typical; 64 mm/14‑flute for spin‑on, or 64 mm/14‑flute cap tool for cartridge housings
• Subaru: 17 mm drain plug; 65 mm/14‑flute cup for spin‑on filters
• Ford: 15 mm drain plug common; 74 mm/14‑flute (small) or 76 mm/14‑flute (FL‑820S) cups; some engines use cartridge housings
• GM/Chevrolet: 15 mm drain plug common; 93 mm/15‑flute cup for many truck filters; some four‑cylinders use 32 mm cartridge caps
• VW/Audi: 13–19 mm drain plug or 8 mm Allen/T45 Torx on some; cartridge caps often 24 or 32 mm
• BMW/Mercedes: drain plugs often 17 mm hex or 8 mm Allen; cartridge caps typically 36 mm

Treat these as guidance only. Engine options and model-year changes can alter both plug and filter tooling requirements.

Recommended tools for a clean, damage‑free oil change

The right tools make the job safer and help you avoid rounding fasteners or cracking plastic components.

• Six‑point metric socket set (13–21 mm) and a few SAE sizes if needed
• Allen (hex) bit sockets (6–10 mm) and Torx bits (T45/T50) for European models
• Cup-style oil filter wrench set (64, 65, 74, 76, 93 mm common sizes; match flute count)
• Torque wrench and a short breaker bar
• New crush washer or sealing ring for the drain plug, plus correct O‑ring for cartridge filters

With these on hand, you can cover the vast majority of passenger vehicles and tighten everything to spec for leak‑free results.

Summary

There’s no one-size-fits-all “oil socket.” Most oil drain plugs take 13–19 mm sockets (14, 15, and 17 mm are especially common), while oil filters may require a 24–36 mm socket for cartridge housings or a cup-style wrench such as 64 mm/14‑flute, 65 mm/14‑flute, 74 mm/14‑flute, 76 mm/14‑flute, or 93 mm/15‑flute for spin‑on filters. Confirm your exact fastener type and size via the manual or by measuring, use six‑point sockets, and follow torque specs to avoid damage.

What tool do I need to change my oil filter?

First you’ll need a ratchet and socket set to remove the oil drain plug, then an oil filter wrench to remove the filter.

What size socket for oil?

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 bolt is needed to change oil?

There isn’t a single “oil change bolt size” because sizes vary by vehicle. To find the correct size for your car, you must identify the specific drain plug bolt head size for your vehicle’s make and model. You can typically use a socket wrench set with common metric sizes like 14mm, 15mm, 17mm, or 19mm. If you don’t know the size, you can buy a vehicle-specific part or use a tool to measure the bolt, such as digital calipers, but a wrench that is too small can strip the head. 
How to Find the Right Size

1. Check Your Vehicle’s Owner’s Manual: Opens in new tabYour manual will often have the specific size of the drain plug. 
2. Consult an Auto Parts Store: Opens in new tabTell the store your vehicle’s year, make, and model, and they can look up the correct size. 
3. Measure the Bolt: Opens in new tabIf you have calipers or a ruler, you can measure the width of the bolt head to determine its diameter. 
4. Test Common Socket Sizes: Opens in new tabIf you don’t know the size, you may have to try the common metric socket sizes in the 14mm to 19mm range. 

Important Tips

• Use the Correct Tool: Use a socket or wrench that fits the bolt head snugly to avoid stripping it. 
• Replace the Washer: Always use a new crush washer when reinstalling the drain plug to prevent leaks. 
• Use a Proper Socket: For best results, use a 6-point socket, as these provide a more secure grip than 12-point sockets and reduce the risk of stripping. 

What size wrench do I need for an oil change?

The size of wrench you need for an oil change varies by vehicle make and model, but a common size is 15mm for the oil drain plug. To ensure the correct fit, check the specific bolt size for your vehicle, as some may require other metric sizes like 13mm or 16mm, or SAE imperial sizes like 9/16″. You’ll also need the correct size wrench or socket for the oil filter, though a universal adjustable oil filter wrench can often work for various filters.
 
This video demonstrates how to remove an oil drain plug with a 15mm socket: 57sDIY Andrew FlockhartYouTube · Jan 20, 2024
For the Oil Drain Plug:

• Identify Your Vehicle’s Specs: Opens in new tabThe most accurate way to know the right size is to check your vehicle’s owner’s manual or look up the specific bolt size for your car’s year, make, and model. 
• Common Metric Sizes: Opens in new tabMany vehicles use a 15mm socket, while others might use a 13mm, 14mm, 16mm, or 17mm socket. 
• Common Imperial Sizes: Opens in new tabSome older vehicles or those from certain manufacturers may use imperial sizes like 9/16″. 
• Use a Socket or Wrench: Opens in new tabA 3/8″ drive ratchet with the correct size socket provides a secure fit and good leverage. 

For the Oil Filter:

• Oil Filter Wrench: A universal adjustable oil filter wrench is a good investment. It can adapt to grip and turn most filter sizes, saving you from having to buy multiple specialized wrenches. 
• Check for Clearance: Some oil filters are recessed and require a specific type of socket wrench for removal.