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Show on a dairy farm should be changed more often than oil In a tractor that is working work-ing steadily under more ideal conditions." "Dont take blackness as a criterion to indicate that your oil needs to be changed. chang-ed. Rather, know when the oil was put in and how much use the vehicle has had. Since the detergents in the oil clean the carbons in the engine, you want it to get black." Jarret said, "It also is important that we train our people to drain the oil from the transmissions, differentials, differ-entials, and hydraulic systems sys-tems as recommended by the manufacturer in the operator's op-erator's manual. Maintenance Mainten-ance books state that the transmission oil should be drained every year to clean the old material out." the engine." He explained oil does not wear out but it does become be-come contaminated. Filters are important to take out abrasive particle material mater-ial that gets in the oil, but there ar e no filters that will filter out substances that go into solution. Sulphuric Sul-phuric acid is one substance sub-stance that develops chem -ically as fuel is burned in the engine. To get rid of such contaminants in solution sol-ution you must drain the oil. that develops chemically as fuel is burned in the engine. en-gine. To get rid of such contaminants In solution you must drain the oil. Jarret emphasized, "You dont look at the color and you don't feel oil to determine de-termine when it is time to change it . You determine deter-mine that by the use of the vehicle. For example, the oil in a tractor that is stopped and started a lot CLEAN OIL OFFERS BEST MAINTENANCE "Tell farmers in your counties that changing oil as recommended is the cheapest maintenance they can have for their tractors and other motorvehicles," Dr. Von H. Jarrett, Utah State University Extension farm machiner specialist, siad. Speaking to county extension ex-tension agents in a training train-ing session at a recent extension conference in Logan, Lo-gan, he said, "The one reason for changing oil is to get the contaminants out of an engine. There are detergents de-tergents in the oil to clean the engine. You must drain ou t the oil to get rid of the carbon and other substances sub-stances that go into solution. solu-tion. Dont leave it in there to contam inate the rest of - - - |