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Show hotter adviintHge thnt is, with greater Rpeed una less fuel consumption if ,e uses fnter-niciMuto fnter-niciMuto gc:ir tlniii if tic allows ttip engine to labor in In'U until it utmost stalls. Many drivers belH-vo th;U cooling is improved If tlie engine is allowed to - Iiibor in this way, but this idfn is !i niist.-ike Unit nuiv be costly Summer Lubrication Heat liiins the body of li.brieatFiig oil, and in many trucks it is advisable ad-visable to us! a heavier oil in sain in or thnn lo winter. In cusps where trouble with lubrication lubrica-tion m hot weather persists the substitution of a heavier oil may be the solution. The truck driver should be warmd not to race the engine with the heavier oil until it has had a chance to warm up. The Radiator During hot weather the truck-radiator truck-radiator should be filled as full us possible and the overflow pipe must uot be allowed to get clogged or slip down in the radiator. In filling fill-ing the radiator, absolutely clean water must be used, und if there is any doubt about it the water should be strained, Iiain water, wh-n it is available, is best for the radiator. The Fan The im port a nee of itdequa te cooling cool-ing during hot weaih'T makes it important that the fan be kept functioning properly. It should hi' rigorously cleaitfd and generously greased, and ihe driver should know that it Is turning freely all the time. t MOTOR TRUCK TIPS f Carburetor Adjustment The motor opera tor may effect a considerable saving during the hot weather by adjusting the ca rb lire to to feed n leaner mixture than is needed in winter. win-ter. In addition to saving moiiey, this adjustment ad-justment actually promotes belter operation, as the engine does not need the greater gasoline content in its fuel that cold wen I her demands. Overheat in g is likely to result if the mixture I is too rich in summer. Climbing Hills The truck driver should be 1 tr.ught that his vehicle will negotiate hills to |