Historically, standard futures contracts for heating oil allowed for delivery of product with sulfur content up to 2,000 parts per million (0.2%). Beginning with the May 1, 2013 contract, the New York Mercantile Exchange (Nymex) switched its specification for the heating oil futures contract to the ultra-low sulfur diesel specification (ULSD). The ULSD contract is a distillate that contains less than 15 parts per million (ppm) of sulfur, the same specification used for most diesel fuel. Many states in the Northeast require the switch over the next several years (see chart) to lower sulfur heating oil. Switching the contract to...