HARNESS AS-WIRING 1958025 - Caterpillar

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.
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