Here is what you should do: TOTAL RECYCLING
USE used cooking oil from your kitchens as engine oil!
Then on the next oil change, collect the old cooking oil from your engine and use it to make bio-diesel
Use the biodiesel in your diesel vehicle with particulate filter in the exhaust.
Take the filter out and collect the carbon deposits. Put them in high pressure and extreme heat from lasers to make industrial diamonds.
Sell some of the diamonds to buy more cooking oil. Use the rest as gifts for the women in the house so that they will cook more good stuff for you with the cooking oil.
Cheers