Oil cans for automobiles used to come in cans that had to be pierced with a metal funnel/spout like the one pictured. The outside of the containers were cardboard and the top and bottom were metal. Needless to say there were alot of broken containers and the cardboard would decompose quickly in the soil and elements allowing the oil to seep into the ground.
They have gone to plastic bottles where as not perfect are better than the previous packaging. The longer neck allows the oil to be poured without the metal funnel/spout. Once the oil is poured the lid can be returned to the bottle and the plastic bottle disposed of properly. If it does get out in the elements plastic will last a much longer time keeping the remaining oil from seeping into the ground.
The latest is a company called Green Earth Technologies is actually making a biodegradable motor oil.
http://www.getg.com/articles/article_detail.php?ArticleID=67
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