CHAIN LIFT 0801572 - Caterpillar

Total Base Number (TBN) And Fuel Sulfur Levels For Caterpillar Diesel Engines
Caterpillar Prechamber Combustion Engines
The TBN for a new oil is dependent on the sulfur level of the fuel used. For precombustion chamber (PC) engines running on distillate fuel, the minimum new oil TBN (by ASTM D2896) must be 20 times the fuel sulfur level. The minimum TBN of new oil 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.Caterpillar's 20 times rule for TBN (Reference: Oil and Your Engine, SEBD0640) versus fuel sulfur was a general requirement developed in the early 1980's for Caterpillar prechamber combustion (PC) system engines. Caterpillar still maintains 20 times TBN value for PC engines. Engines built prior to 1990 can continue to use single grade viscosity oil or commercial oils, provided the engine operates satisfactorily.Fuel sulfur neutralization of new oil formulations in direct injection (DI) system engines is more effective. Field results indicate that direct injection (DI) combustion systems and the oils now recommended for those engines will operate at an oil TBN equal to ten times the fuel sulfur.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.
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.
Engine 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 to 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