heck if we are so worried about the environment shouldn't we all sell our tractors or junk them so they can't pollute anymore. Use hand saws and hatchets. Mules to pull our equipment, then reuse their waste as green fertilizer. Man I know we have to look out for the planet, but it's getting to where we can't have an idea. Where are the heavy metals going when they recycle the oil. I bet the exhaust we put out every day doing things we really don't have to do are way worse than the guy that recycled his used oil for bar oil. We all want to point out the little things we have learned from TV, internet, magazines, political speeches, whatever media; then we drive, mow, plow, whatever. Don't put down a guy that's probably not putting out as much "green house gas" as the rest of us.
We just have to use some common sense. sorry about the rant.