There's a new addition to Shell's ROTELLA line of heavy-duty engine products. The new Shell ROTELLA DFA hits store shelves nationwide this summer. The all-season diesel fuel additive keeps truck fuel injectors clean, prevents gelling and improves cold starting.

"This new product," said Peggy Montana, vice president of Marketing for Equilon Lubricants, "has advanced additive technology specifically designed for today's high-performance, fuel-efficient, low-emission diesel engines."

ROTELLA DFA exceeds Cummins L-10 specifications for fuel-injector cleanliness. It also prevents fuel gelling down to minus 40 degrees F and improves cold starting. "Truckers may notice smoother warm-ups, reduced white smoke at start-up, decreased engine noise and reduced misfire," Montana said. "ROTELLA DFA is clearly a product that enhances diesel performance."

Shell ROTELLA DFA also improves the cetane number of fuel by up to three points. Higher cetane numbers translate to easier engine ignition and quicker start-ups even at low temperatures.

One 96-ounce bottle of Shell ROTELLA DFA treats up to 300 gallons of fuel. Each 32-ounce bottle treats up to 100 gallons. Equilon recommends using the diesel additive every 10,000 miles during the summer and in every tank during the winter.