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Experiences with Multigrade Heavy Duty Engine Oils in Military Gasoline and Diesel Engines
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English
Abstract
In 1973 a modified SAE 10W-30 multigrade heavy duty engine oil designated OMD-75 was introduced into a wide variety of British Army equipment in place of the single SAE 10 and SAE 30 grades previously used. Generally the introduction of the multigrade engine oil into a wide variety of different equipments has been successful. However, some problems with the use of a multigrade engine oil in certain diesel air-cooled engines has been encountered probably associated with high base stock volatility. A number of other problems are also described and examples given where multigrade engine oils have caused difficulties. OMD-75 has been successfully used in Allison transmission systems.
The use of the “FZG” gear machine as a method of test for the shear stability of viscosity index improvers is described and results presented for a number of different types of polymers. The FZG machine was found to be more severe than a diesel-injector rig and no correlation seems to exist between the two different methods of test.
Authors
Citation
Morris, P., "Experiences with Multigrade Heavy Duty Engine Oils in Military Gasoline and Diesel Engines," SAE Technical Paper 750791, 1975, https://doi.org/10.4271/750791.Also In
References
- Morris P R Washbrook C C “Assessment of Multigrade Engine Oils for use in British Military Equipment “Performance Testing of Lubricants for Automotive Engines and Transmissions.” Applied Science Publishers 1974
- Ministry of Defence Defence Guide “Petroleum, Oils and Lubricants (POL) and Allied Products.”
- Co-ordinating Research Council Report No 409
- Wood L G 1950 Brit. J. App. Physics 1 202
- Jan 1970
- Bramhall A D Wright B “Prediction of Viscosity Losses of Multigrade Oils in Service” “Performance Testing of Lubricants for Automotive Engines and Transmissions.” Applied Science Publishers 1974
- Private communication from Lubrizol International Laboratories Hazelwood, England