What size wrench takes off an oil filter?
There isn’t a universal wrench size for oil filters. The correct tool depends on the filter’s outer diameter. Cap-style (socket) wrenches come in several fixed sizes, often in the 64–68 mm range, 74–76 mm, or 86–90 mm, while strap or chain wrenches can adapt to a wide range of diameters.
Understanding oil filter wrenches
Oil filters vary in outer diameter by engine and vehicle. Removal tools must match the filter’s diameter or provide enough grip without slipping. Below are the common tool types and the typical size ranges you’ll encounter.
The following list covers common wrench types and typical size ranges you’ll encounter when shopping for a replacement tool for spin-on oil filters.
- Cap-style (socket-style) oil filter wrenches: these come in fixed sizes. Common options include 64–68 mm, 74–76 mm, and 86–90 mm. Some brands also offer larger sizes (around 93–101 mm) for bigger filters.
- Adjustable strap (band) wrenches: these grip the outer body of the filter and are adjustable to fit most standard spin-on filters.
- Chain or grip wrenches: wrap around the filter for extra bite, useful when space is tight or the filter is particularly stubborn.
- OEM- or brand-specific kits: certain manufacturers require a dedicated size that matches their filters exactly.
When selecting a wrench, prioritize matching the filter’s outer diameter and ensure there’s enough clearance around the filter to use the tool without hitting adjacent components.
Measuring and identifying the right size for your vehicle
To determine the correct tool size, take a few practical steps that reduce the chance of slipping or damaging the filter or housing.
The following list explains how to identify the right size before attempting removal.
- Measure the filter’s outer diameter across the widest point using a tape measure or calipers. Spin-on filters are typically around 2.5" to 3" (63.5–76 mm) in diameter, but can vary by engine.
- Consult your vehicle’s service manual or the filter specification for the exact wrench size recommended by the manufacturer.
- If space around the filter is limited or you’re unsure of the exact size, start with a strap wrench or adjustable filter wrench that can accommodate multiple diameters.
- When you install a new filter, ensure the gasket is replaced and properly seated to avoid leaks.
Having the right tool on hand reduces the risk of slipping and damaging threads or the filter housing, especially on tight engines or older vehicles.
Summary
The right wrench size for removing an oil filter depends on the filter’s outer diameter, not a single universal size. Most common spin-on filters use cap-style wrenches in sizes such as 64–68 mm, 74–76 mm, or 86–90 mm, with larger options available for big filters. Strap or chain wrenches offer flexibility when a fixed-size cap won’t fit. Always measure the filter, check the vehicle manual, and consider space constraints under the hood. By selecting the appropriate tool, you can remove and replace oil filters safely and effectively.
