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Caterpillar Diesel Engine Oil (DEO)
Caterpillar oils have been developed and tested in order to provide the full performance and service life that has been designed and built into Caterpillar Engines. Cat DEO exceeds the requirements of the ECF-1 specification by passing four additional proprietary tests of diesel engine oil. Caterpillar oils are currently used to fill diesel engines at the factory. These oils are offered by Caterpillar dealers for continued use when the engine oil is changed. Consult your Caterpillar 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:
Cat DEO (Diesel Engine Oil) (SAE 10W-30)
Cat DEO (Diesel Engine Oil) (SAE 15W-40)Cat DEO multigrade oil is formulated with the correct amounts of detergents, dispersants, and alkalinity in order to provide superior performance in Caterpillar diesel engines.Cat DEO multigrade oil is available in various viscosity grades that include SAE 10W-30 and SAE 15W-40. Choose the correct oil viscosity for the ambient temperature by referring to table 1. Multigrade oils provide the correct viscosity for a broad range of operating temperatures.Multigrade oils are effective in maintaining low oil consumption and low levels of piston deposits.Consult your Caterpillar dealer for part numbers and for available sizes of containers.Note: Cat DEO multigrade exceeds the requirements of the ECF-1 specification. Cat DEO SAE 15W-40 exceeds the performance requirements for the following API classifications: API CI-4, API CI-4 PLUS, API CH-4, API CG-4 and API CF. Cat DEO SAE 15W-40 oil also passes additional proprietary tests that include the following tests: sticking of the piston ring, stable oil control, tests for wear and tests for soot. Proprietary tests help ensure that Caterpillar multigrade oil provides superior performance in Caterpillar diesel engines. In addition, Caterpillar multigrade oil exceeds many of the performance requirements of other manufacturers of diesel engines. Therefore, this oil is an excellent choice for many mixed fleets. True high performance oil is produced by using a combination of the following factors: industry standard tests, proprietary tests, field tests and prior experience with similar formulations. The design and the development of Caterpillar lubricants that are both high performance and high quality are based on these factors.Commercial Oils
Engine Crankcase Fluid Recommendations for all Caterpillar Diesel EnginesNote: Commercial oils that conform to the requirements of the Caterpillar ECF-1 specification are acceptable but these oils are not preferred.
Only commercial oils that meet the requirements of Caterpillar's ECF-1 (Engine Crankcase Fluid specification - 1) are acceptable for use in Caterpillar commercial diesel engines. API CH-4, API CI-4, and API CI-4 PLUS oils that have not met the requirements of Caterpillar's ECF-1 specification may cause reduced engine life.
API CG-4 multigrade oils are acceptable for all Caterpillar commercial diesel engines. When API CG-4 oils are used, do not exceed the standard oil drain interval. Refer to this Operation and Maintenance Manual, "Maintenance Interval Schedule" for the oil drain interval. Refer to Special Publication, SEBU6251, "Caterpillar Commercial Diesel Engine Fluids Recommendations" for more complete information about choosing oils for your Caterpillar diesel engine.
Failure to follow these oil recommendations can cause shortened engine service life due to deposits and/or excessive wear.
Lubricant Viscosity Recommendations
The proper SAE viscosity grade of oil is determined by the minimum ambient temperature during cold engine start-up, and the maximum ambient temperature during engine operation. Refer to Table 1 (minimum temperature) in order to determine the required oil viscosity for starting a cold engine.Refer to Table 1(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.If ambient temperature conditions at engine start-up require the use of multigrade SAE 0W oil, SAE 0W-40 viscosity grade is generally preferred over SAE 0W-20 or SAE 0W-30.Note: SAE 10W-30 is the preferred viscosity grade for this engine when the ambient temperature is above −18 °C (0 °F) and below 40 °C (104 °F).
Table 1
Lubricant Viscosities for Ambient Temperatures
Ambient Temperature
Viscosity Grade Minimum Maximum
SAE 0W-20 −40 °C (−40 °F) 10 °C (50 °F)
SAE 0W-30 −40 °C (−40 °F) 30 °C (86 °F)
SAE 0W-40 −40 °C (−40 °F) 40 °C (104 °F)
SAE 5W-30 −30 °C (−22 °F) 30 °C (86 °F)
SAE 5W-40 −30 °C (−22 °F) 50 °C (122 °F)
SAE 10W-30(1) −18 °C (0 °F) 40 °C (104 °F)
SAE 10W-40 −18 °C (0 °F) 50 °C (122 °F)
SAE 15W-40 −9.5 °C (15 °F) 50 °C (122 °F)
(1) SAE 10W-30 is the preferred viscosity grade for the 3116, 3126, C7, and C9 diesel engines when the ambient temperature is above −18 °C (0 °F) and below 40 °C (104 °F).Note: Supplemental heat is recommended for cold soaked starts below the minimum ambient temperature. Supplemental heat may be required for cold soaked starts that are above the minimum temperature that is stated, depending on the parasitic load and other factors. Cold soaked starts occur when the engine has not been operated for a period of time and when the cooler ambient temperatures allow the oil to become more viscous.S O S Services Oil Analysis
Caterpillar has developed a tool for maintenance management that evaluates oil degradation and the tool also detects the early signs of wear on internal components. The Caterpillar tool for oil analysis is called S O S oil analysis and the tool is part of the S O S Services program. S O S oil analysis divides oil analysis into three categories:
Component wear rate
Contamination of oil
Condition of oil
Identification of oilNote: Refer to Special Publication, SEBU6251, "Caterpillar Commercial Diesel Engine Fluid Recommendations" or contact your local Caterpillar dealer for additional information concerning the S O S oil analysis program.Lubricant Recommendations for the Transmission
The proper oil vis