Steven Levy Enterprises buys and sells new, unused, and used industrial surplus oil filled transformers. Browse our inventory of used oil filled transformers available for purchase. Oil-filled transformers use oil as the cooling medium. A cooling medium is important to stop the transformer from overheating and becoming a potential fire or explosion hazard. Oil-filled transformers require maintenance procedures to be performed more often than with dry-type transformers. Oil-filled transformers are known to be more efficient than dry-type transformers. Tell us what surplus oil filled transformers you have for sale or call us at 713-910-4337.