The Z06 has dry sump. It has nothing to do with cooling the oil however.
The early Z06's of the sixth generation have have 'air' cooled oil coolers (circa 2006-2010). The 2011-2013 have factory 'coolant' cooled oil coolers which ARE more efficient. The seventh gen Z06 has coolant cooled oil coolers also.
The issue was NOT summer heat either (on air cooled coolers). It is winter warming.
There are two styles. One, is the cooler built into the radiator. I prefer those.
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