Many drivers don't think much about what happens to the old oil after a trip to the quick-lube place, or where the burned out battery goes when a mechanic puts in a new one.
But some businesses are finding there is gold buried under car hoods.
In the second of a four part series called "Bottom Line: Green", Statehouse Bureau Chief Karen Kasler explains what some companies are doing to bring dirty motor oil and depleted batteries `back' into cars.
