I had my 6.0 back to the dealer to fix some stuff (still under the 30 day warranty) including a squeaky belt. They say the belt is "glazed". Can this be, or they just blowing smoke up my

? In the oasis report it says "Tensioner assembly drive belt replace" That was in Dec of '07. The dealer says they can put some belt dressing on it, but in 30 miles it will start squeaking again. BS or truth?