Pour the used oil back into oil bottles (a rather messy job) or into an old container. Then take the bottles to a recycling center or set them out with your trash (only if your trash collector accepts used oil). To find a recycling center near you, go to
earth 911.com and enter "oil" and your zip code in the search bars. Each recycling center lists whether they accept oil and filters, or only oil. Some states require oil filters to be drained before disposal in the trash, while others prohibit tossing them in the trash completely. To find your state's oil filter disposal rules, go to
http://filtercouncil.org/index.php?page=recycle and enter your state in the drop-down menu.