Typically performed during an oil change or anytime engine condition or performance is in question, oil filter inspection is a great troubleshooting tool as well. Oil filter inspection begins by simply removing the filter from the engine, placing it in a pan and letting it drain for 10-15 minutes prior to being cut. An Oil Filter Inspection Tool (KRC1201R), offered by KRC Racing, is recommended when performing this task. While it may be tempting to grab a hacksaw, it's best to use a specialized tool since it cuts clean, similar to a can opener, without creating metal debris that may be confused with engine wear. Follow by clamping the tool in a vise and placing the filter so that the outer housing may be cut as the thumb screw is tightened. Slowly rotate the filter by hand while tightening the thumbscrew until the filter has been cut all the way through.

Once the housing has been cut completely open, remove the filter element. Continue by using a utility knife to carefully cut the end caps off of the element so that the "pressure side" of each pleat may be examined for debris. Keep in mind that all things mechanical wear and there will always be a few tiny pieces of bearing material, silicone sealer, etc. lodged in the element. Most engine wear found is typically no bigger than a pencil head. If the engine has just been rebuilt, expect to find a generous amount of assembly lubricant in the filter as well. Again, no cause for concern. On the other hand, if the pleats contain a generous amount of what appears to be bearing material or other metal fragments, further investigation may be in order. Removing the oil pan and inspecting the bearings then becomes the next step.