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Total Base Number (TBN) and Fuel Sulfur Levels for Direct Injection Diesel Engines
The TBN required in a new oil is dependent on the sulfur level of the fuel used. 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 sulfur level, see the chart below.
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High TBN oils that are not within the API CG-4 or CF-4 categories can produce excessive piston deposits leading to a loss of oil control and bore polishing.
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