Originally Posted by BlooMule
At 55000 miles it should not be using any oil IMO.
I don't know the specifics of GM's caddy line, but many cars have 'normal oil consumption' levels established lately, especially with direct injection and/or forced induction (like on my GLI)
even my old '02 BMW 330CI had a specified oil consumption interval mentioned in the factory owner's manual. (I don't recall specifically what it was, I just got in the habit of checking the oil every or at worst every other fill up)