chadman

I'm trying to decide which antifreeze to use in my newly rebuilt engine?? I have installed a new alum radiator and also run an alum intake and waterpump. I have been thinking the orange type may be easier on the alum than the old reliable green stuff, any suggestions or experience??

jcswm

I put the orange Dexcool in mine
just don't leave it in. it turns to a gel (easy to flush out) when it gets old!!

68/70Vette

For the last 30 or so years I've just used pure ethlyene glycol as a coolant in my cars...no water. The ethylene has a boiling point of 165 degrees F so the cooling system of my cars really doesn't get pressurized. Ethylene is not as efficient as water as a coolant, so if you have a marginal cooling system, pure glycol is not an option. If you are replacing your stock copper radiator with an aluminum then you probably have the option of going to pure ethylene glycol. (Aluminum radiators cool better than copper) The cooling channels on my 1968 engine block are rust and sludge free. They appear to be coated with a white powder after all of these years. My stock copper heater core (37 years old) core appears to be in great condition.

carbster09

Evans NPG+ looks like it might be the business. Its a lifetime coolant with better cooling properties than EGW mix.

If I keep the standard EGW mix what is the best ratio for hot texas and the cold NEast? I am thinking 80/20 in Texas, and more like 50/50 if I drive up north?

carbst er

SteveG75

I am using the new Zerex G-05 from Valvoline. No problems after about 16 months.

http://www.valvoline.com/pages/produ...asp?product=10

I have a BeCool radiator, aluminum heads and aluminum water pump.

Good article about antifreeze by Patrick Bedard of Car & Driver here:
http://www.caranddriver.com/article....&page_number=1

wildman378

50/50 mix of water and the good ole green stuff (if you can still find it and not that yellow crap)

stay away from the dexcool/orange coolant because that was put in 95 and up cars with componets that will not get harmed by it.

also DO NOT mix orange and green etc.

the yellow is supposed to mix with anything but i'd just go green if you can still find it somewhere

lebvette

I have a buddy that ownes a radiator shop. He swears by the green stuff and distilled water.

Gordonm

I have been using it for years. It seems like I change it about every two years just because I am doing something that requires I drain the system. I just replace it with new green stuff.