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Model year 2007 and newer (U.S. EPA 2007 certified) on-highway diesel engines REQUIRE the use of Ultra Low Sulfur Diesel (ULSD) fuel (≤ 15 ppm sulfur)."Sulfur-free" diesel fuel (≤ 10 ppm sulfur) is strongly recommended for use in "EURO IV" certified on-highway diesel engines, while diesel fuel with ≤ 50 ppm sulfur is acceptable.Low Sulfur Diesel (LSD) fuel (≤ 500 ppm sulfur) is strongly recommended (required in the U.S.) for use in model year 2006 and older on-highway diesel engines, while diesel fuel with ≤ 5000 ppm sulfur is acceptable for use in areas of the world where allowed by law. Diesel Oxidation Catalyst (DOC) equipped engines require the use of LSD fuel or ULSD fuel.
Note: In the U.S., burning fuel with greater than 15 ppm sulfur in model year 2007 and newer on-highway diesel engines is illegal and punishable with civil penalties.The two basic types of distillate diesel fuel are No. 2 diesel fuel and No. 1 diesel fuel. No. 2 diesel fuel is the most commonly available summer grade diesel fuel. No. 1 diesel fuel is a winter grade diesel fuel. During the winter months fuel suppliers will typically blend No. 1 and No. 2 diesel fuel in various percentages in order to meet the historical low ambient temperature cold-flow needs for a given area or region. No. 2 diesel fuel is a heavier diesel fuel than No. 1 diesel fuel. In cold weather, heavier fuels can cause problems with fuel filters, fuel lines, fuel tanks, and fuel storage. Heavier diesel fuels such as No. 2 diesel fuel can be used in diesel engines that operate in cold temperatures with an appropriate amount of a well proven pour point depressant additive. For more information on fuels which include blends of No. 1 and No. 2 diesel fuel, consult your fuel supplier.When you use No. 2 diesel fuel or other heavier fuels, some of the fuel's characteristics may interfere with successful cold weather operation. Additional information about the characteristics of diesel fuel is available. This information contains a discussion on the modification to the characteristics of diesel fuel. There are several possible methods that can be used to compensate for the fuel qualities that may interfere with cold weather operation. These methods include the use of starting aids, engine coolant heaters, fuel heaters, and de-icers. In addition, the manufacturer of the fuel can add cold flow improvers and/or blend No. 1 and No.2 diesel in various percentages.Not all areas of the world classify diesel fuel using the No. 1 and No. 2 nomenclature described above. But, the basic principles of using additives and/or blending fuels of different densities in order to help compensate for the fuel qualities that may interfere with cold weather operation are the same.Starting Aids
The use of a starting aid is a conventional method of assistance for cold starts in low temperature conditions. A variety of starting aids are available for Caterpillar engines. Follow the recommendations that are provided by the manufacturer of the