I too think 5000 miles on a rear sprocket is ludicrous, 30-40,000 surely would be the acceptable norm?
IMHO rear sprockets should be a warranty item regardless of age of the car as its the milage that kills it not the ticking clock.
If they supplied me one F.O.C. I would fit it myself and save them the trouble.
But as it is I'll just have to put up with the scalded cat in the boot.
