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Extended Drain Passenger Car Engine Oils
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English
Abstract
The trend to longer oil drain intervals for passenger cars has hastened in the last few years. Most earlier studies on the effects of extended drains on oil and engine performance were conducted prior to 1973 when significant engine modifications were made to reduce exhaust emissions. This paper describes several taxi and other road tests, supplemented by laboratory programs, conducted since 1973. The total field program included approximately 225 cars over sixteen million kilometers. All of the work reported is with 5W and 10W multigrade engine oils.
Taxi test results have shown sludge build-up and oil thickening to be the most significant failure modes as drains are extended beyond approximately 12 000 km. This occurs even with oils giving excellent Sequence IIIC and VC results. Oil thickening and particularly engine sludge and filter plugging were more severe in winter driving and with leaded gasoline. With conventional 5W multigrade SE oils, engine wear, particularly in the cam and lifter region, was found to be very dependent on test conditions and was severe in some. However, with extended drain additive technology, excellent overall performance has been demonstrated with 5W30 engine oils at 24 000 km oil drains under summer driving conditions. Used oil corrosivity, measured in the laboratory, and engine wear were found to be relatively independent of used oil acidity measured by Total Acid Number (TAN).
In terms of oil thickening, results from a low temperature starting/crankability program with fresh and used oils suggested that for a 100% increase in CCS viscosity, the minimum starting temperature increased by only 1-3°C. Basestock volatility was found to be critical in controlling low temperature viscosity increases at extended drains. Superior additive technology and low volatility, narrow cut basestocks were both considered necessary for adequate performance at 24 000 km oil drains.
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Authors
Topic
Citation
Carey, L., Stover, W., and Murray, D., "Extended Drain Passenger Car Engine Oils," SAE Technical Paper 780952, 1978, https://doi.org/10.4271/780952.Also In
References
- Reeves L.L. Cabba T. “Field Experience with Longlife Oils in Montreal Police Cars” Paper 660772 SAE Fuels and Lubricants Meeting Houston, Texas November 1-3 1966
- Gergel W.C. Sheahan T.J. “Maximizing Petroleum Utilization Through Extension of Passenger Car Oil Drain Periods - What's Required?” Paper 760560 SAE Fuels and Lubricants Meeting St. Louis, Missouri June 7-10 1976
- Pless L.G. “A Study of Lengthened Engine Oil Change Intervals” Paper 740139 SAE Congress Detroit February 25 March 1 1974
- Pless L.G. “Interactions Among Oil Additive and Engine Operating Parameters Affecting Engine Deposits and Wear” Paper 720686 National West Coast Meeting San Francisco August 21-24 1972
- Savin J.W. Chamberlin F.E. “Effect of Lubricants and Maintenance on Engine Cleanliness in a Two-Year Test Program” Lubrication Engineering 26 64 1970
- Gerber A.F. Smith R.G., Jr. “Some Effects of Exhaust Gas Recirculation Upon Automotive Engine Intake System Deposits and Crankcase Lubricant Performance” Paper 710142 SAE Congress Detroit January 1969
- Pless L.G. “Some Effects of Experimental Vehicle Emission Control Systems on Engine Deposits and Wear” Paper 710583 SAE Fuels and Lubricants Meeting Montreal June 1971
- Stambaugh R.L. Kopko R.J. Franklin T.M. “Effect of Unleaded Fuel and Exhaust Gas Recirculation on Sludge and Varnish Formation” Paper 720944 SAE Fuels and Lubricants Meeting Tulsa October 31 November 2 1972
- Overton R. Steere D.E. Carey L.R. “Field Performance of Diesel Engine Oils” Paper 760270 SAE Congress and Exposition Detroit February 23-27 1976
- Holmes G.W. Overton R. “Experiences With Extended Oil Drain Intervals in Diesel Truck Engines” Paper 780958 SAE Meeting Toronto November 13-16 1978
- McMillan M.L. Stewart R.M. Smith M.F. Jr. Rein S.W. “Low-Temperature Engine Oil Pumpability in Full-Scale Engines” Paper 750691 SAE Fuels and Lubricants Meeting Houston June 3-5 1975
- Stewart R.M. “Engine Pumpability and Crankability Tests on ‘W’ Graded Engine Oils Compared to Bench Test Results” Paper 780369 SAE Congress and Exposition Detroit February 27 March 3 1978
- Callat R. “Rapid Laboratory Methods: Differential Infrared and Calibrated Membrane Filtration” “Rapid Methods for the Analysis of Used Oils” Scientific Publications 1971
- “Oil Filter Test Procedure” SAE J806a 1972