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 - The Great Escape - by Dave Hollrah. It all began Monday with a little baling of second crop on the lake shore field, and as I drove out past my sister and her hubby's place, this small calling sound could be heard from the general direction of their manure pile. Out of the yard, over the cows and bale piles, through the dozer piles, poplars, and brush, out onto the ditch grade road, past the noisy 6.2 diesel engine pulling my well traveled Suburban along. Well it sure didn't take me long to figure out what it was because I alrea
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