need advice white scum

A bit of condensation in the oil is not uncommon. I think it is made worse if you have (components that allow your motor to cool off fast) like aluminum heads, valve covers, intakes, big header tubes, etc as they cool off so fast. Plus if you live in a really humid environment like I do. Everytime I have dropped my oil pan I find a little of the white scum right at the very front of my pan - under the timing cover which is aluminum on mine.