The best replacement for used oil is waste oil.

The best alternatives to used oil are rated as following:
★★★★★  waste oil
★  new oil

Your alternative for used oil is not listed? Suggest!
Speaking about used oil, one probably shouldn't forget about diesel fuel.

Other search terms related to used oil and their ratings are:
★★★★★ diesel fuel
You have in mind a companion for used oil and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of used oil in all years. Click on graph for more.
used oil
waste oil
new oil