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Cat Diesel Engine Oil (Cat DEO)
Cat oils have been developed and tested in order to provide the full performance and service life that has been designed and built into Cat engines. Cat oils are currently used to fill Cat Diesel Engines at the factory. These oils are offered by Cat dealers for continued use when the engine oil is changed. Consult your Cat dealer for more information on these oils.Due to significant variations in the quality and in the performance of commercially available oils, Caterpillar makes the following recommendations:
Table 1
Cat Lubricants    Viscosity Grade    
Diesel Engine Oil-Ultra Low Sulfur     Cat DEO-ULS     SAE 15W-40    
SAE 10W-30
Cat Cold Weather DEO-ULS SAE 0W-40    
Diesel Engine Oil     Cat DEO     SAE 15W-40    
SAE 10W-30 Note: Cat DEO-ULS and Cat DEO multigrade oils are the preferred oils for use in this Cat Diesel Engine.Commercial Oil
Note: Non-Cat commercial oils are second choice oils for your engine.
Caterpillar does not warrant the quality or performance of non-Cat fluids.
The three current Caterpillar ECF specifications are: Cat ECF-1-a, Cat ECF-2 and Cat ECF-3. Each higher Cat ECF specification provides increased performance over lower Cat ECF specifications.A commercial oil must meet the following standards to be considered an equivalent of a Cat Diesel Engine Oil:
Table 2
Cat Engine Crankcase Fluids (ECF) Definitions    
Cat Performance Requirement     Cat ECF Specifications Requirements    
Cat ECF-3     API CJ-4 Oil Category performance requirements    
Cat ECF-2     API CI-4 / CI-4 PLUS Oil Category performance requirements    
Passing standard Cat C13 engine test per API requirements
Oils of sulfated ash > 1.50 percent are not allowed
Cat ECF-1-a     API CH-4 Oil Category performance requirements    
For oils that are between 1.30 percent and 1.50 percent sulfated ash, passing one additional Cat 1P SCOTE test ("ASTM D6681") is required
Oils of sulfated ash > 1.50 percent are not allowed In selecting oil for any engine application, both of the following must be satisfied: the oil viscosity and the category of oil performance or the specification for oil performance. Using only one of these parameters will not sufficiently define oil for an engine application.The proper SAE viscosity grade of oil is determined by the following temperatures: minimum ambient temperature during cold engine start-up and maximum ambient temperature during engine operation. Refer to Table 3 (minimum temperature) in order to determine the required oil viscosity for starting a cold engine.Refer to Table 3 (maximum temperature) in order to select the oil viscosity for engine operation at the highest ambient temperature that is anticipated.Note: Generally, use the highest oil viscosity that is available to meet the requirement for the temperature at start-up.
Table 3
Lubricant Viscosities for Ambient Temperatures for Cat Diesel Engines    
Oil Type and Performance Requirements     Viscosity Grade     °C     °F    
Min Max     Min     Max    
Cat ECF-1-a, Cat ECF-2, Cat ECF-3     SAE 0W-30     −40     30     −40     86    
Cat Cold Weather DEO-ULS
Cat ECF-1-a, Cat ECF-2, Cat ECF-3     SAE 0W-40     −40     40     −40     104    
Cat DEO-ULS
Cat ECF-1-a, Cat ECF-2, Cat ECF-3     SAE 5W-30     −30     30     −22     86    
Cat DEO-ULS SYN
Cat DEO
Cat ECF-1-a, Cat ECF-2, Cat ECF-3     SAE 5W-40     −30     50     −22     122    
Cat ECF-1-a, Cat ECF-2, Cat ECF-3     SAE 10W-30     −18     40     0     104    
Cat DEO-ULS
Cat DEO     SAE 10W-40     −18     50     0     122    
SAE 15W-40 −9.5     50     15     122    Note: A cold soaked start occurs when the engine has not been operated recently, allowing the oil to become more viscous due to cooler ambient temperatures. Supplemental heat is recommended for cold soaked starts below the minimum ambient temperature. Supplemental heat may be necessary for cold soaked starts that are above the minimum temperature depending on factors such as parasitic load. Total Base Number (TBN) and Fuel Sulfur Levels
The use of Cat S O S Services oil analysis is recommended strongly for determining oil life.The minimum required Total Base Number (TBN) for oil depends on the fuel sulfur level. The TBN for new oil is typically determined by the "ASTM D2896" procedure. For direct injection engines that use distillate fuel, the following guidelines apply: