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Diesel engine oils containing a balanced additive package composed of oxidation, corrosion, wear, rust and foam inhibitors plus ashless dispersants and metallic detergents provide long engine life. The major factor is metallic detergent component which contributes alkalinity to the oil and has a direct effect on engine cleanliness and durability. Increased detergent alkalinity reduces deposits and wear, resulting in improved oil control and longer engine life. Careful selection of detergent components is required to control cylinder-bore polishing in diesel engines to assure optimum antiwear and oil control performance.