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Cat Diesel Engine Oils
Cat fluids have been developed and tested by Caterpillar to provide the full performance and service life that has been designed and built into Cat engines. The quality of finished oil is dependent on the quality of the base stock, the quality of the additives, and the compatibility of the base stock and additives. Cat fluids are formulated of high-quality refined oil base stocks and additives of optimal chemistry and quantity in order to provide high performance in engines and machine components. Cat fluids are used for factory fill of Cat engines and components and are offered by Cat dealers for service fills and as aftermarket products. Consult your Cat dealer for more information on these Cat fluids.Cat recommends the use of the lubricants given in Tables 1 and 7 in diesel engines covered by this Special Publication.This information applies to Cat machine engines. For more lubricant recommendations refer to other SEBU publications listed earlier in this Chapter.Note: The optimal application of the lubricants is dependent on the oil quality and the maintenance practices. Such practices include contamination control, oil tank management and general handling practices.Cat Diesel Engine Oils Recommendations
Cat DEO-ULS and Cat DEO multigrade oils are the preferred and recommended oils for use in ALL Cat diesel engines that are covered by this Special Publication. Commercial alternative diesel engine oils are, as a group, second choice oils. Refer to Table 4 below for information.
Table 1
Cat Engine Lubricants Recommendations
Tier 4 certified Nonroad Engines Required: Cat DEO-ULS (API CK-4)
Commercial, second-class oils: API CK-4; Cat ECF-3/API CJ-4
Non-Tier4 Certified Nonroad Engines Recommended: Cat DEO-ULS (API CK-4); Cat DEO (API CI-4/API CI-4 PLUS)
Commercial, second-class oils: API CK-4; Cat ECF-3/API CJ-4,
Cat CF-2; Cat ECF-1-a Note: Cat DEO-ULS (API CK-4) oil is backwards compatible and can be used in all engines with some restrictions related to fuel sulfur level, refer to Table 4 for more details. Cat DEO (API CI-4/API CI-4 PLUS) can be used in engines that are Tier 3 emissions certified and prior, and in engines that do not use aftertreatment devices.Caterpillar has released a new Cat diesel engine oil, Cat DEO-ULS that is per the latest API CK-4 heavy duty engine oil category. The new Cat DEO-ULS replaces the prior Cat oil that was per API CJ-4 category, but it is of the same brand name. The new Cat has the following characteristics:
Improved oxidation stability (per ASTM D8048).
Improved air release (Per ASTM D8047).
Improved used oil shear stability per tighter specification limits.
Preserved the same level of phosphorous, 1000 ppm (parts per million) (mg/kg), to ensure achieving long hour engine durability goals
Same chemical limits as API CJ-4 oil category, designed for use in engines with aftertreatment devices.Note: The new API FA-4 Heavy Duty Engine Oil Category is NOT allowed in Cat engines. API FA-4 is a special low High Temperature High Shear (HTHS) viscosity oil that is designed for certain 2017 and later On-Highway engine models.Note: Each of the Cat ECF specifications provides increased performance over lower Cat ECF specifications.