need advice white scum

hi all i need some help i just took my oil cover off my new 416 and there is white scum in the valve covers i use rotella t 15-40 with lucas zinc additive i run a 180 thermostat and no pcv valve i think it is moisture but never had this prob before and it worrys me thjis engine is probuilt r3 eddy heads and cost a lot and it uses oil and smokes when you put your foot in it there is 1500 miles on it any input would be very helpfull thanks all :wack: