Exhaust back pressure and oil consumption

[JettaPeter]

is there a relationship between exhaust back pressure and oil consumption...recently the muffler fell of my 86 turbo and when driving back up north from florida I have had to add oil at every fill up...this was not the case when going down there...I am sure it does not help when driving 75mph and I have no problems starting the car up in the morning in 13deg.F weather