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327,000 miles on my 2010 SS M6. Engine is original, but had to replace some Wheel bearings, Driveline parts and such. I don't think the V6 typically holds up as well as the V8, especially the LS3 that came in the Manual Transmission cars. The L99 V8 that came in the Automatic Transmission cars isn't quite as reliable due to more complexity with the AFM and Variable Timing. Overall, I'd say they are very reliable cars. Like with anything else keep up on the regular maintenance.
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