Equilon Lubricants has added a diesel fuel additive (DFA) to its line of Shell Rotella engine oil and lubricant products. The all-season DFA is designed to keep diesel engine injectors clean, prevent fuel gelling down to minus 40 deg. F, and help with cold-weather starts. In addition, it is said to reduce black smoke and soot, and disperse any water that gets into a truck's diesel fuel supply.

According to Equilon, the product exceeds Cummins L-10 specs for fuel-injector cleanliness. A 96-oz. bottle of Rotella DFA treats up to 300 gallons of diesel fuel. In the summer, Rotella DFA should be added to fuel every 10,000 miles; during the winter, at every fill-up.
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