AT THE Society of Automotive Engineers' Mid‐Year meeting at Detroit in May there were several papers presented which gave details of work that has been sparked off due to the reporting of thickening of crankcase oils in motor cars used at high speeds for long periods of time. This results from increasing use of motorways where it is now possible to travel hundreds of miles at speeds that rarely drop below 60 to 70 mph. Cases have been reported where the engine oil have thickened up to a grease consistency.
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