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.
Experiences with Multigrade Heavy Duty Engine Oils in Military Gasoline and Diesel Engines
Sae Technical Papers
1975 SAE International Off-Highway and Powerplant Congress and Exposition ; 1975
1975-02-01
Aufsatz (Konferenz)
Englisch
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