how can i tell if my trailblazer uses oil?

If you can,t see any leak,s,,then it is going out the tail pipe,rub finger in tail pipe.

it turns my finger black but its not wet back there so now what

IF its. black,then it,s burn,t oil.

Your engine ethier has a cracked ring or valve seat,s are bad.

Have a buddy follow you down the interstate. Stomp on it a few times and have your buddy see if you are leaving a trail of blue smoke. Pull your plugs also and see if they are covered with black soot. They should be clean.

it would be making a noise wouldnt it

NO it would not make noise,it would just burn the oil,reelin give you and idea,rev it up,watch it smoke .