Having worked in an EPA agency, the push has been to reduce used oil, just like the push to reduce gasoline consumption. I don't agree with it but that has been the push, mostly California driven. That push is part of why engine manufacturers have all these don't need to change oil engines. People just haven't been responsible with the used oil when they change it. Too much of it has ended up in local streams and ground water, land fills etc.. Perfect example, neighbor changes oil, it sits in the drain pan for months outside until the rains come. Water fills the drain pan, oil overflows, goes down driveway, and into nearby creek. They didn't mean harm but once in the creek it kills a salmon spawning area. So the way to stop that is make it harder for people to change the oil, and that is what the EPA agencies have pushed for.
