I love driving this car. When purchasing I opted for the 3.6 liter engine, in part, because it has timing chains that are supposed to survive the life of the car, as opposed to the 3.2 which the owner's manual suggests replacing at 100k miles. The owners manual even states that if you don't replace the timing belt on the 3.2 liter you risk severe engine damage. Well the timing chain broke on my 3.6 CTS at 70K miles and the dealership estimates that the repair costs will be about $2500. Dealership also told me they had another 3.6 CTS in at the same time, for the same problem.
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