I'm going to catch flak over this, but oh well! I drive very few miles a year, averaging approx 4400, use Red Line and Purolator PureONE filters, and still change both 4 times a year, with about 1100-1200 miles on them. Why? No other reason than it can't hurt, and I like fresh oil in my engine (one vehicle owner). And, frankly, couldn't care less about the costs.