SHAFT AS 0909003 - Caterpillar

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(Y) TBN by "ASTM D2896" (X) Percentage of fuel sulfur by weight (1) TBN of new oil (2) Change the oil when the TBN deteriorates to 50 percent of the original TBN.Use both of the following guidelines for fuel sulfur levels that exceed 1.5 percent:
Choose a multigrade oil with the highest TBN that meets one of these specifications/categories: Caterpillar ECF-1 or API CG-4.Note: API CH-4, CI-4, and CI-4 PLUS oils that meet the requirements of the Caterpillar ECF-1 (Engine Crankcase Fluid - 1) specification are acceptable for use in Caterpillar machine diesel engines. API CH-4, CI-4, and CI-4 PLUS oils that do not meet the requirements of the Caterpillar ECF-1 specification may cause reduced engine life.
Reduce the oil change interval. Base the oil change interval on the oil analysis. Ensure that the oil analysis includes the condition of the oil and a wear metal analysis.Excessive piston deposits can be produced by an oil with a high TBN and/or a high ash content. These deposits can lead to a loss of control of the oil consumption and to the polishing of the cylinder bore.
Operating Direct Injection (DI) diesel engines with fuel sulfur levels over 1.0 percent may require shortened oil change intervals in order to help maintain adequate wear protection.