I tried engine ice,This is not a scientific study just my opinion.I wen't riding last thursday after work, it was 73 degrees out with 50% humidity.It takes me 20 minutes to get dressed and get loaded,and another 20 minutes drive home.My cylinder was still hot and the coolant was very very warm when i got home.I also noticed my plug insulator was medium gray I alway's have tan or a light brown color winter or summer. I don't know why the plug color changed i would guess different temperature of combustion chamber because of the engine ice.I know for a fact when i got home before checking my coolant temperature with golden spectro or prestone it was cool i am talking 80 degrees plus 70% humidity and the cylinder was just warm.So any way i wen't back to golden spectro coolant today I cut a few laps and my plug color came back to the tan brown side same jetting same mixture.The temperature today was 63 degree's.I know for sure the engine ice changed the insulator color on my plug grey and i think because it was running hotter I know I t was only 63 degrees today,but the spectro coolant was cool in10 minutes.Plus with the same plug it changed back to the tan brown side.I don't know what was up with the insulator color i alway's had tan or brown depending on the temperature's never grey.My opinion i will stick with spectro.