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There is a small squeek on the left rear suspension on my 09 c6 that goes away after a few miles of driving - no big deal. But being **** about an otherwise quiet car are there zerk fittings on the suspension in the rear that require periodic grease?
However.....I can't imagine that you'd be getting a squeak from that area on an '09, unless they just didn't grease that fitting at all when it came down the assembly line!
But.....squirt some lube in there and see if it does anything for you.