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.
Whether it’s personal relationships or business, communication is important. The longer you live the more you discover how many things can interfere with good communication.