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ChrisSlicks · 08-28-2012, 03:17 PM

Coolant thermostat starts opening at 180F but isn't fully open until 200F by my measurements (reading coolant temp on OBDII). Cooling fan kicks on at around 220F.

The viscosity of 5W30 at 180F is approximately twice that of oil at 210F. It isn't going to hurt anything but you are losing some efficiency.

08-28-2012, 03:17 PM	#7 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	Coolant thermostat starts opening at 180F but isn't fully open until 200F by my measurements (reading coolant temp on OBDII). Cooling fan kicks on at around 220F. The viscosity of 5W30 at 180F is approximately twice that of oil at 210F. It isn't going to hurt anything but you are losing some efficiency. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms