Is this steam from oil fill normal?
 

Hello everyone! So I pretty much saved this truck. I just had 5k worth of mods/work done which you'll see in my signature. Was curious if this steam from the oil fill tube is normal? The oil cap isn't bouncing off so I'm assuming my motor is in decent health but just wanted to be sure!

You're making a lot more pressure now. You might want to add one of these to relieve some of it:

Cummins Valve Cover Crankcase Breather Kit 5.9L 12 Valve