milkshake on oil cap

hi i have a 1986 supra n/a which i have just bought for £123.09 it has had head gasket done all valves crank reground etc car starts and sounds great car does not use any oil or water and does not overheat but i have found a little milkshake on the underside of the cap car does not smoke when started could the car just need an oil change as it has stood for two years only been started and run occasionally in that time i have also heard that condensation can cause this as was told on another forum any help would be most appreciated:popcorn:

When putting a car back on the road that has sat I just clean it up and keep an eye on things for a few months. There is no telling how well the car was maintained, or what may have gone bad while sitting. Just tune it up and go.

im going to give it an oil change and flush out the radiator to see if this cures it will let you know what happens

just to let you know no more milkshake on oil cap was just condensation from sitting for so long car runs great