The OIL-SAVER is simple in appearance, but a great deal of research has gone into its design. It consists of a basic rectangular funnel that’s molded to hold five-six inverted oil bottles, the contents of which gradually drain out and into the depository of choice — usually another oil bottle, leaving the plastic bottles clean enough for recycling. And with thousands of funnels already in use, they have proven themselves to be versatile, practical tools that create a two-fold benefit: they save money while allowing the consumer to be part of a collective recycling effort, helping to prevent global contamination.