Blue smoke means your engine is leaking oil inside itself and burning up, you'll have to replace various gaskets and seals, depending on where the leak is.
There are several options in the market. I have tried can refills which include Refrigerant, Oil, Stop Leak, Leak Detector and O-Ring conditioner all in the same can. It works effectively as long as...
You can put the 2003 bumper on a 2002 car, but you will also need to replace the headlights with those from an 03-05 Neon and replace the hood with that of an 03-05 car.