Common to see, the yellow is emulsified oil/water.
That can be caused by engine running cold, as in missing or stuck open thermostat, or short run times when the engine doesn't get up to temperature long enough to boil off the condensation.
Also remember, the old engines don't have PCV (positive crankcase ventilation),nothing to keep the moisture laden gasses, (a normal byproduct of combustion) moving. So the condensation tends to stay in the engine.
Unless there is a mystery coolant loss, don't be concerned about it. Just be sure the thermostat is working, and try to get it out an work it at operating temperature.
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Today's Featured Article - Usin Your Implements: Plow and Disc - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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