possibly start of ANOTHER problem

[bigfred]

this is on my 99.5 psd 155.000 miles with 6 position tuner(hyperchip c.a.r.b approved), 4" exhaust,afe intake ,adrenaline hpop , gt38r, gauges.that said june 1st the turbo went out pushing oil into the exhaust replaced it with the 38r when i installed it no problems fired right up except smoke due to the oil in the exhaust but after month of driving it cleared up now over the weekend was idling for about 10 minutes waiting for the mrs. so she gets in i take off mind you i did'nt punch it ,and the truck started to smoke but quickly cleared up with in 2 blocks and it happened again while setting in traffic.oh yeah smoke is grayish blue. no codes,wts light goes on & off soon as the truck fires up. anyone now where to start or the cause,appreciate any help.thanks