NUT,SHOE 0944847 - Caterpillar

Caterpillar Direct Injection Diesel Engines
For direct injection engines running on distillate diesel fuel, the minimum new oil TBN (by ASTM D 2896) must be 10 times the fuel sulfur level, and the minimum TBN is 5 regardless of low fuel sulfur level. See the illustration.
Oil TBN shown by ASTM D2896 (Y). Percent of fuel sulfur by weight (X). New oil TBN (1). Change oil when the used oil TBN limit (2) is reached.In areas where the fuel sulfur exceeds 1.5 percent, choose an oil with the highest TBN that is within the API CF-4 or CG-4 categories, and shorten the oil change period based on oil analysis. The oil analysis should evaluate oil condition and wear metals. High TBN oils that are not within the API CF-4 or CG-4 categories can produce excessive piston deposits leading to a loss of oil control and bore polishing.
Operation at fuel sulfur levels over 1.5 percent may require shortened oil change periods to maintain adequate wear protection.
Lubricant Viscosity Recommendations
The proper SAE viscosity grade oil is determined by the minimum outside temperature at cold engine start-up, and the maximum outside temperature during engine operation. Use the minimum temperature column in the lubricant viscosities chart determine the oil viscosity required for starting a "cold soaked" engine. Use the maximum temperature column in the lubricant viscosities chart to select the viscosity for operation at the highest temperature anticipated. In general, use the highest viscosity oil available that still meets the start-up temperature requirements. Synthetic Base Stock Oils
Synthetic base stock oils are acceptable for use in Caterpillar engines and machines if these oils meet the performance requirements specified by Caterpillar for a particular compartment.Synthetic base stock oils generally outperform non-synthetics in two areas:* Improved low temperature viscosity characteristics, especially in Arctic conditions* Improved oxidation stability, especially at high operating temperaturesSome synthetic base stock oils have performance characteristics that enhance the service life of the oil. However, Caterpillar does