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... cation of the lubricant in terms of viscosity or fluidity. For instance, a low S.A.E. number indicates that the oil is of low viscosity, which means that it flows more readily than oil with a high viscosity rating. It will be appreciated, therefore, that oil with a low S.A.E. number is essential if easy starting is to be obtained in cold weather, whereas in hot weather a high viscosity oil is desirable in order to keep oil consumption within normal limits. The use of upper cylinder lubricant is recommended at all times, but most particularly during the runningin period. See page 33 for recommended brands. Even the best oils in the engine become contaminated during use, with unburnt fuel, carbon, metallic particles, and moisture, and it is therefore most important that the oil is changed at the recommended mileages. Multigrade Motor Oils: In addition to the recommended lubricants listed on page 33, we approve the use of multigrade oils, as produced by the oil companies shown on our list, for all climatic temperatures unless the engine is old and in poor mechanical condition. Some are more expensive than the recom mended motor oils because of their special properties and greater fluidity at low temperatures. Oil Level: The oil should never be allowed to fall more than \ in. (12.7 mm.) from the ‘FULL’ mark on the dipstick. It is advisable to wipe the ...
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