[Fat Charlie]

Just because the vast majority of lube oil is reused as heating oil doesn't take away from its recyclability. That's just a problem of economics- where I work we generally pay someone to take the used oil away once in the summer, but the rest of the year it's free heat. We're going to be burning something for heat, and the used oil just shows up here without us doing anything. It wouldn't make sense for us to buy heating fuel.

I'd believe lube oil pollutes more than gas or diesel- it's got more energy too. I know a guy with an old diesel generator, and it's got a lot more oomph when he adds waste oil to the diesel.