If you change your own oil recycle it by taking it to a recycling depot that accepts motor oil or setting it at the curb if you have curbside recycling pick-up. Contents may be flammable, irritating, corrosive, toxic, or poisonous. As with all products containing solvents buy only what you need and, work in a well-ventilated room. Carefully calculate your needs and don't over buy. These words tell you how hazardous a product is.
Caution is the least hazardous.
But there are also alternatives to these that are even less hazardous. Store products away from children's reach, heat sources, high traffic areas. Dispose of products through local household hazardous waste collection programs or as instructed on the product label. You may be able to give them away or you can call the state Household Hazardous Waste Hotline for information on collection programs. If you have paints or cleaners call your local charitable organizations to see if they are in need of these products.