I worked for O'Reilly Auto parts until about 2019 and we were turning rotors almost every day. Like has been said the minimum thickness is stamped on the inside of cap most times. Front should be 1.181"s new, discard thickness is 1.102" and minimum thickness after turning is 1.122". We used specific brake calipers to measure them. And, as already stated here the OEM rotors were coated to make them last longer but yours have probably worn that coating off.If your rotors are not grooved and they meet the turning requirements I would have them turned. You will probably get about half the original mileage on them.
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