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All-Year Commercial Oils
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1974 by SAE International in United States
Annotation ability available
Event: Fleet Week
A method based on apparent viscosity of engine oils at 0°F measured by the cold cranking simulator to estimate minimum starting temperatures for SAE “W” numbered engine oils is described.
Based on apparent viscosity measurements, a nonpolymer-containing SAE 20W-30 engine oil would satisfy 100% of gasoline or diesel engine powered fleets where temperatures are consistently above 0°F. Based on climate and vehicle distribution by geographical location, about 15% of gasoline engine powered vehicles require engine oils with low-temperature properties found in SAE 5W or SAE 10W engine oils. Diesel engines using a nonpolymer-containing SAE 20W-30 engine oil would obtain the benefits of SAE 20W low-temperature starting properties and SAE 30 high-temperature protection.
Initial field tests of gasoline-powered vehicles in severe winter service indicate adequate low-temperature properties for a nonpolymer-containing SAE 20W-30 engine oil compared to an SAE 20W-20 grade normally used in this application in winter. This method may also be used to compare low-temperature properties of engine oils containing different V.I. improvers.
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CitationMullen, T., Lendener, W., and Frino, M., "All-Year Commercial Oils," SAE Technical Paper 740524, 1974, https://doi.org/10.4271/740524.
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