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Kelly, K. J.
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Performance of an Advanced Synthetic Diesel Engine Oil

ExxonMobil Research and Engineering Co.-K. J. Kelly, S. Kennedy, J. E. Spagnoli
Published 2000-06-19 by SAE International in United States
This paper describes the performance of a synthetic diesel engine oil formulated to satisfy the most demanding lubrication requirements of modern heavy-duty diesel engines designed to meet North American and European emission regulations. The combination of an advanced fully synthetic base stock system and a customized additive system has resulted in an SAE 5W-40 oil with unique performance characteristics which include exceptional low and high temperature properties, excellent engine performance in laboratory and field tests, and an independently-documented, measurable fuel economy benefit relative to conventional mineral-based multigrade diesel engine oils. In addition to the cold starting and low volatility benefits derived from the synthetic base stocks, this technology has demonstrated outstanding engine performance in the areas of soot dispersancy, wear protection, engine cleanliness, and oil consumption control. This synthetic diesel engine oil exceeds the requirements of the API CH-4 and ACEA E4/E5 categories, as well as a number of more demanding North American and European engine builder specifications. Engine performance in the laboratory tests required to satisfy these specifications is presented, as well as extended…
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Extended Oil Drain Performance Capabilities of Diesel Engine Oils

Caterpillar, Inc.-D. S. Nycz, G. M. Karl, D. F. Gullett, R. G. Dussault, B. Butler, T. H. Becker
Mobil Oil Corporation-R. C. Morrow
Published 1998-10-19 by SAE International in United States
This paper describes the results of a comprehensive field-testing program conducted in modern low-emission heavy-duty diesel engines to evaluate the extended oil drain capabilities of several diesel engine oils of varying performance levels. The data generated in the 59-truck trial, which was conducted over a two to three year period, provide support for extension of engine oil drain intervals when a premium mineral diesel oil is used rather than a fighting-grade mineral diesel product. The field trial results also document the performance of a premium fully synthetic engine oil at four times conventional oil drain intervals. Engine inspections conducted after 500,000 test miles confirm that the extension of oil drain intervals with premium diesel engine oils has no negative impact on engine durability. In addition to the extended oil drain interval performance, the fully-synthetic SAE 5W-40 oils evaluated were found to provide approximately a 3% reduction in fuel consumption relative to conventional SAE 15W-40 mineral oil based products in the applications tested.
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