In theory, your oil filter has a simple job: capture wear-causing contaminants and hold them in the filter media so they don’t run amok throughout your engine. But lots of factors can throw a wrench into this plan, which can raise questions about oil filters and filtration. Here are some of the most common.
Early automobile engines didn’t use oil filters, or air filters for that matter. For this reason frequent oil changes were a must. Motor oil quality wasn’t really that important in those days, anyway. It was the discarded by-product of processes designed to create other products from crude oil, like fuel, benzene and other petrochemicals.