180 degrees is too cold. The system should be near 195 degrees for best combustion and lowest emissions. At lower temperatures gasoline doesn't vaporize as well, and liquid fuel does not burn. It just goes out the tail pipe, wasted. Pistons are made slightly out-of-round so they will be round when they expand from normal engine heat. Excessive wear will take place when the engine isn't up to normal temperature. That 10 degree difference is not significant but at 190 degrees you should have nothing to worry about. Be sure the shroud is in place behind the radiator and the radiator's cooling fins aren't crumbling from corrosion.
Monday, April 23rd, 2012 AT 10:28 AM