Ray28101994

So I'm really in love with this car, but one thing that is bugging me when I viewed and test drove the car is that when I removed the oil cap when car was running their seemed to be white smoke/steam being forced out the top...people said this could be back pressure but as their was no oil coming from stock area I am very unsure on what to do! Please advise me as I would like to get it fixed so I can enjoy the car without worry!!