The term "recreational oil changer" was coined to define people that change their oil far more than necessary because they actually enjoy doing it. It's easy to understand the psychology behind the recreational oil changing. It's the visceral feel of the tools, the victory when that old oil filter breaks free, the hot dirty oil pouring out, the joy of oiling of the gasket on the new filter, that new copper or fiber gasket on the drain plug, the clean clear oil going in, and the sense of accomplishment when you start the car, the oil light comes on for a moment, then goes out. For $20-50 in oil and parts, it's pretty cheap entertainment, but if people would be content to do it only when it provides some benefit to the vehicle it would be better. That apply to majority people on this forum.