High oil pressure after i changed oil

What was the oil pressure before you changed it /and what is it now/and what type and grade of oil did you put in when you serviced it..
As for burning oil which is the smoke problem is it only on start up/all the time driving/only after idleing.
as its main problem is the oil must be thinner oil than what was in there,as 20W 40 Shell and a new filter should have brought it back to normal/Plus have you got any oil leaks on the engine /and how many miles on the clock.
Let me know how you go ASAP. Ron