We can’t believe that we have to include this on the list, but as oil-change intervals have gotten longer, we’ve noticed an increase in people who simply forget to change their oil. Remember that your engine’s oil doesn’t just lubricate parts to prevent metal-on-metal violence. The oil is also the janitor that cleans up after the combustion process and keeps things squeaky clean. Do you really want to damage the thing that brings you so much joy?

Do I Really Have To Change My Oil Every Year?

MO Wrenching: How To Change Your Oil + Video