Modern Analytical Techniques to Establish Realistic Crankcase Drains

This paper presents two new test methods for used gasoline engine oil analyses. The differential infrared analysis procedure permits rapid identification of inherent chemical changes in the used oil as well as amount and nature of foreign contaminants. The membrane filtration procedure measures the quantity of insolubles on various pore size filters. These methods predict engine deposit formation and can be used to establish realistic crankcase drains. The present conventional used-oil analysis methods are shown to have serious shortcomings. These new test methods are currently being applied in field tests covering gasoline and diesel engine trucks as well as railroad diesel equipment.