I am wondering if i should be concerned if at startup, of my 06 ram fullsize truck, there is blue smokethat appears. the truck has about 5500 miles on it. It also is a hemi.

 

is it alot? i think ive noticed mine blow a little smoke when i first crank it up, but i just figured that it was because it was cold outside. ive never notice it being blue, its always been white on mine

 

I would stop by your dealer and lodge a compliant about it NOW.
More than likely it just needs a little more breaking in at 5500 miles, but, if it does continue to smoke after 10k miles, YOU got a problem that needs to be addressed.

I'm guessing valve guide seals, as Dodge runs then loose. That is where the HEMI tick comes from. Yours may be too loose--but it also a little soon to tell--IMO

 

It only smokes a little a startup and only after the truck has sat for awhile (8-10 hours). It never smokes anytime the engine has already warmed up. The only change I have made lately is that I filled my gas tank with premium gas instead of the usual mid-grade brand.

 

With 5500 miles, it's break-in is done. I've heard of Diesel engines giving better mileage after extended miles,butdoubt a gas engine is going to see better oil control after this many miles.
This smoke issue is what I would expect from a vehicle that was owned by someone who believes modern engines don't need a break-in period, or unfortunately was abused by test drivers before the vehicle was sold.

 

your not supposed to run 91 or higher in these trucks, only 89octane

 

What???? is that really the case, If so I am glad you made that post. I have been running 87 in mine and was gonna give it some higher octane on the next fill-up

 

I fail to see why running a higher octane would cause problems. The only thing the higher octane is good for is a lower risk of pinging and early detonation. (unless you have your pcm tuned like myself, then you get some good performance increases).