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They may last 100,000 miles or more. It depends on your driving and preferences. I've seen a few shocks fail and of course if that happens you need to replace it asap.
My C6 is lowered all the way in the front on stock bolts and nearly all the way (1 full turn left) on after-markets bolts in the rear. I replaced my shocks at 35k with Bilstein HD shocks. The new shocks have made a huge difference in the ride and handling.
Depending on your driving style, shocks maybe all you need which is true in my case.
I wish I had replaced the stock shocks much sooner!
My C6 is lowered all the way in the front on stock bolts and nearly all the way (1 full turn left) on after-markets bolts in the rear. I replaced my shocks at 35k with Bilstein HD shocks. The new shocks have made a huge difference in the ride and handling.
Depending on your driving style, shocks maybe all you need which is true in my case.
I wish I had replaced the stock shocks much sooner!
I R&R the shocks at 15k on my '08 C6 with Bilstien's HD's. HUGE difference, like a different car altogther. Start there and you'll get a good idea whether or not you need to go further.