Well, the argument about wasting money only really takes hold when we are talking about a lot of oil. A gallon of oil to change the oil in my NH TC33DA is really a drop in the bucket. Now if we were talking about my 12.7L Detroit that takes just shy of 10 gallons for an oil change, then the argument would start to stick. IF it floats some folk's boat to change the oil a couple of time a year, or even monthly, it is really not a waste. They are in their comfort zone and they are willing to pay for it so that they sleep well at night. It might be a waste to someone else, but that just makes them different. We all don't need to march to the same drummer. And unless they are dumping the oil on the ground, the used oil is not wasted. It is recycled or used in a variety of ways. So there is no real waste of resources either.