First thing I would do is to check the lines for oil to see if it is leaking. I don't know about the C5 locations but it might be the same as my C6, if memory serves me right one fitting was near the firewall and the other was near the fender. You should be able to follow the lines to find the fittings. I recharged mine when I upgraded the radiator, really easy.
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08 C6 Z51 Coupe with TVS2300, a little more than stock HP/TQ.
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