Hi JPerry,how many miles are on your truck PFlorenzano? That small amount of smoking may be valve stem seals. Probably no big deal just smokes a little till they get warm and seal off.
My 98 6.5L idles at 30 psi with 128,000 miles on the engine. 20 at idle should be ok. If you can, ask old boy what the oil psi is @ 2,000 rpm driving down the road. It should be over 40 psi.looking at a 98 6.5 the picture on the internet has a picture of the dash and the truck sitting there idleing is only holding 20psi of oil pressure? is this safe??