i have a 1994 lt1 trans am with a stock exhaust system and i havent had it running for 2 weeks or so, and when i started it up to go down to get the newpaper, i looked in back and there was light blue smoke coming out of 1 of the tail pipes. i just got the motor rebuilt and have only mabe 10 miles on it so far. i did wash and wax the car and put injector cleaner in it, i thought mabe that would cause it. can anyone help me? oh yeah it does have a small exhaust leak.

 

could be assembly lube burning off, does it only do it on start-up and then quit or is it constant?

 

update: after running for a while today, it doesnt to it much anymore. thanks for your help though