Royal Purple's Duralec line of synthetic lubricants includes the Super, Ultra, ATF, MTF, and Gear Oil HD products designed to optimize equipment performance in the construction, mining, agriculture, over-the-road trucking, and heavy-duty fleet markets. The Super synthetic motor oils include 5W-30, 5W-40, 10W-30, and 15W-40. The Ultra motor oils, which include 10W-30 and 15W-40, are fortified with a high level of zinc and phosphorus anti-wear additive. The Ultra line is ideal for two-cycle and four-cycle diesel engines. The ATF is a synthetic automatic transmission fluid with a low co-efficient of friction. The MTF offers manual transmission fluid as MTF 10, MTF 30, and MTF 50 products that meets the requirements of Caterpillar TO-4, Allison C-4, API CF and CF-2, Eaton, and Dana transmissions. The Gear Oil HD product maximizes power throughout the drive train, according to the company.