Abstract
Results are presented of various studies related to extended oil drain intervals in diesel truck engines. In a field test program, performance comparisons were made on two drain intervals in three different engines using both mono- and multi-grade oils. Three typical customer operations were monitored. Laboratory evaluations were made of typical and severely stressed used oils, and oil filter life and durability were assessed. It was concluded that proper engine installation and maintenance are the most significant factors in extending drain intervals and ensuring normal engine life. Efficient combustion and well-filtered air are essential in extending drain intervals. Abrasives are the major problem in such extension. High Total Acid Number (TAN) correlated with wear. Further investigation is needed to determine the TAN, Total Base Number (TBN) and wear relationship. Some of today's commercial oil filters have limited service life due to poor construction. The economics suggest that drain intervals of 30,000 to 40,000 km. provide the best cost/risk relationship for the Canadian environment.
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