Quote:
Originally posted by TigerOats
Your problem is caused by the viscosity of the coolant. As the coolant temps drop the viscosity increases. At about -10C the coolant viscosity is increasing exponentially and hence the reason for the temps leveling off.
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and that's about the best assesment one can put out, right on!
You might consider the windshield wiper fluid: although it still has water, the methanol in it actually behaves very nicely at lower temps.
Hey, it's a buck or two, give it a shot! Save your old coolant, in case you decide to go back to it (or dispose of it safely, please!) and flush clean in between.