Cold start oil leak
 

Hey everyone! I have a 99 f350 and for the past few days, when it is cold started it will leak oil for about 60 seconds until the engine warms up a little bit and then it stops completely. It only happens when the truck has not been started in at least 8-10 hours and it's cold outside. Once it is warmed up it never leaks again until the next day. I know it is not the blow by tube because the leak is coming from the driver side, and if I'm not mistaken the blow by tube is on the passenger side. Any help would be greatly appreciated