After a few hours of running my car or after long idle, it hasd some white or light grey smoke emerge from underneath of my car. Seems like when the vehicle overheats and when I turn it off for a bit and turn it back on it seems just fine. Any ideas of what it could be and how harmful?

 

oil leaking and burning under the hood maybe??? where on the car is it coming from

 

Thats what i thought it was originally. it comes from underneath past the oil filter going towards the cab. Itll come from all around it and i have had a few oil leaks, maybe they just havent cleaned it all up