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GM uses a lower boiling point fluid (DOT 3) as the factory fill because it has greater longevity and it is less hygroscopic than DOT 4. DOT 4 is more track appropriate for obvious reasons. The factory fill is appropriate for all street use and most owners will never go on track. It is easy to bleed/swap so no worries.
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold)
'15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold)
'12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)
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