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ZDDP Levels of Mobil Delvac
What are the current ZDDP levels for Mobil Delvac 15W-40? Is it recommended for classic engines with flat tappet camshafts?
-- Corey VanBlarcom, Rochester, N.Y.
Mobil Delvac 1300 Super 15W-40, which meets API CJ-4 performance standards, has a Phosphorus limit of 0.12 wt%. With respect to your question on slider tappets, Mobil Delvac 1300 Super 15W-40 meets Cummins CES 20081. This indicates the oil is suitable for use in their midrange engines (with Ultra Low Sulfur Diesel used in the US) which include the ISB and ISC series engines.