[gmonde]

i have seen this as well, if the garage is still humid from a rain or humid day and throw some heat turned on to warm up the garage the condensation drops on the oil pan will mix with the oil dripping off will mix like that also,i donot have the heat in my garage on all of the time,(kerosine is 3.80 a gallon) cold to hot makes everything sweat
i had the same thing i was ready to pull the motor thinking cracked a main artery,if not convinced let the motor sit maybe throw the presure tester on it and see if you notice any water disappearing ,loosen the drain plug the water will come out first and leak thru the treads of the loose plug i good luck gmonde