If you’re prone to changing your own oil, then one of the most important tools you will need is a oil filter wrench. Your oil filter is located under your hood, and unless you have a direct connection to your oil filter, you’ll need a wrench to loosen it so you can remove and replace the filter. This is one of the most common things a car owner will learn to do, which means it’s very important to get right. (You could also just use pliers, but oil filters require a pretty firm grip.)