Royal Purple Purple Ice coolant additive?
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i just watched them test this on horsepower tv this morning. from their results at operating temp and idle it stayed around 10-15 degrees cooler and same as for a drive. they simulated the drive on their dyno i cant remember how long of a drive but it was supposed to be as if you were driving up hill for 20 miles or 20 minutes i cant remember exactly. but it stayed 10-15 degrees cooler as well. these tests were all done with straight water in the radiator and 2 bottles of that royal purple ice additive. seems like it works!!