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Extended Oil Drain Performance Capabilities of Diesel Engine Oils

Mobil Oil Corporation-R. C. Morrow
Caterpillar, Inc.-D. S. Nycz, G. M. Karl, D. F. Gullett, R. G. Dussault, B. Butler, T. H. Becker
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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Effect of Volatility Changes on Vehicle Cold-Start Driveability

Mobil Oil Corporation-L. Abramo, F. A. Kouhl
Mobil Research and Development Corporation-C. E. Baxter, P. J. Costello
Published 1989-09-01 by SAE International in United States
Controlled cold-start driveabilily tests using an urban driving cycle were conducted on fifty-one customer vehicles representing 1972-1988 models typically on the road in New England. Tests were conducted at ambient temperatures of 21-30°F with two test fuels and the fuel found in the vehicle tank. Nineteen vehicles (37% of the total fleet) showed significant deterioration in driveability performance with a low Reid Vapor Pressure (BVP) test fuel (nominal 9.0 psi) compared to a typical RVP fuel (nominal 13.5 psi). These nineteen cars showed, on average, four times as many driving stalls and almost three times as many heavy hesitations with the low RVP fuel. Consumer-type driveability tests conducted with 1984-1988 model cars confirm that reducing volatility to the levels adopted by some northeastern U.S. states and being considered by EPA (9.0 psi maximum in areas permitted up to 11.5 psi by ASTM D 439 (1)*) can result in decreased customer satisfaction, particularly in the transition before and after the mandated low RVP period when ambient temperatures are lower and the low RVP summer gasoline is…
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