1999 Sterling CAT 3406E blue smoke after long idle

I have a new to me 1999 Sterling AT9500 with a CAT 3406E, has about 650,000 miles or so on it. I've noticed that if I idle for extended periods, 30 minutes or longer and go to leave, that I have blue smoke and the burning oil smell coming from the exhaust. It's only present under load and clears up within a minute and isn't present running down the road according to another trucker following me. The truck isn't consuming oil and blow by is very minimal, no coolant or fuel present either. I know the turbo was replaced by the previous owner with a Borg-Warner S430SX and there's no sign of oil on or around the turbo, only very little up by the turbo/exhaust flange. The truck was parked for almost 8 months before I bought it, could that be an issue? Maybe need to re-torque everything?

 

Yeah it was at a dead idle. I'm gong try bump it up next time, but trying to avoid idling at all

 

Never heard of that before! I learn something new everyday!