I did (partially did) a clutch fluid change. I tried the Rogers method I saw on another forum. My 2015 z51 M7 has about 16500 km. I sucked up the old fluid from the reservoir and it was brown. I replaced this with new DOT 4 fluid and pumped the clutch about 30 times between fluid changes. I used a syringe bought from CT so the amount removed and replaced would be the same. I cycled the exchanged about 8 times until the fluid started coming out fairly clear. I know the total fluid was not replaced but at least this cleans up the fluid somewhat.