Evans waterless coolant

When I mentioned the NGK heat range numbers, that was from memory. Whatever the numbers were, I went two ranges colder. Must have been from 5 to 7.

For the record, when I replaced the Evans with 50/50 the gauge temperature didn't change and the IR readings didn't change. But when I also changed the thermostat from a 195 to a 160, that made a big difference.

However, the colder thermostat didn't seem to help the pinging problem. I suppose that's because as Dan says, the coolant temperature is not the same as the combustion chamber temperature.