How to select suitable engine oils and determine when to drain crankcases by means of simple tests; good oil changes slowly in service and formation of sludge and increase or decrease in viscosity signal need for change; charts show results of 20 tests among truck fleets.
How fleet man can find each truck's proper period
Commercial Car J
Commercial Car Journal and Operation and Maintenance ; 45 , n 4 ; p 17 + 40
1933
Article (Journal)
English
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