Freefallin

I got some Dexcool %100 concentration I'm looking to put it after a flush and drain but I'm confused as to what dilution/concentration to go with, %50 or %70.

Engine is stock LS1 with quite a bit of miles on it.

Thing I would like to know is (my question basically)... is the higher the concentration the faster or more it cools the engine, working more like coolant? Hence good in very hot weather. Or is it the other way around, the higher the concentration the faster it warms the engine, working more like antifreeze? Hence good in very cold weather.

.boB

iTrader: (1)

The best cooling comes from plain water. And that can be improved a little bit with a surfactant like Water Wetter or Purple Ice.

I run 25% antifreeze for the lubricant and anti-corrosion properties, and a bottle of Water Wetter. But my car is rarely exposed to temps<0*.

Nissan LS240

iTrader: (1)

water will cool better, but water also boils and freezes quicker than coolant, so unless its only a drag car, some coolant is needed, I run ~33% coolant but I'm in LA so temps don't see freezing much, although this year we had lots of snow and ice

Freefallin

The average temp is 115 here around this time a year. Coldest it gets is 83 and that's for like a month or two a year, and then its back in the oven.

cmac06

iTrader: (16)

Antifreeze has a much higher specific gravity than water, so heat transfer is reduced. The only reasons for antifreeze are to keep water from freezing, and provide anti corrosive agents. You don't need to worry about freezing and some of the surfactants have the anti corrosive agents. You still need to use deionized water in either case.

.boB

iTrader: (1)

I wouldn't use more than 25% antifreeze, and a bottle of surfactant.