In Canada and parts of the Middle West, temperatures well below 0°F. are not uncommon in winter. In such cases, S.A.E. 10 W. Motor Oils are regularly used and these may even be diluted with up to 15% kerosene to overcome starting difficulties. Dilution is not a very good practice and the use of high V.I. motor oils of low pour point, suitably inhibited to give resistance to oxidation at operating temperatures is preferable.
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