92 pickup, 22re 110,000 miles 4x4. While driving it will randomly smoke a lot out of the exhaust for a good 10-15 seconds then go away. It's definitely oil, not coolant. It does it probably once every time I start the truck and drive around. Changed the head gasket and valve seals about 1000 miles ago and it just recently started doing this. Any ideas?

 

Verify the crank pressure system is working as intended (PCV valve and fresh air line)