So lets say the motors been flushed and is as clean as it can be, what type of fluid would be the best. (I know this question is like asking what engine oil is the best,) but is there a preference on which type would be a higher quality? Ones that you guys have used
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Are you asking what type of coolant is the best, or what brand is the best?
Here's the skinny, there is a TON of different kinds of anti-freeze compounds out there. Here's the list;
American Green. A light-medium green with inhibitors that include silicates and phosphates. The old standard you can purchase anywhere. Recommended replacement 2 years or 30,000 miles.
Prestone American Yellow Gold. Some think it has a green cast to it, but gold is the color of the dye. It also includes silicates and phosphates.
DexCool Orange. A long life coolant that features sebacate (an organic acid) and 2-EHA as the primary inhibitors. It’s used in GM cars for original equipment.
Japanese Green. Usually a deeper green than American green, with inhibitors that include phosphates (no silicates). If it’s a conventional coolant, the recommended life span is typically 2/30. It’s also available in an extended life formula and the intervals go up to 5/100.
Toyota Red. A conventional Japanese coolant with phosphates but no silicates. Due to a similarity in color, it’s often mistaken for Dex-Cool.
Toyota Pink and Honda Deep Green Extended Life. These new extended-life Japanese coolants use phosphates for fast protection (no silicates) and a single organic acid (sebacate) and other inhibitors.
VW/Audi Pink. The version used in models sold in the U.S. is an organic acid type, primarily sebacate.
European/Ford Yellow. More of a yellow than Prestone American Yellow Gold. Its inhibitors include a relatively low dose of silicates (no phosphates), plus benzoate. Euro yellow is sold in the U.S. aftermarket as type G-05.
Chrysler Group Orange. The dye is orange, but the formula is G-05, the same as European/Ford Yellow.
Korean Blue. You also may have seen blue dye in some European cars (BMW and Volvo, among others). It’s similar to European/Ford yellow.
In your '79 engine, you'll be good to go with just good old fashioned American green ethylene glycol. If you're asking for a specific brand, Peak, Prestone, Xerex, I offer you no opinion, I went with NAPA brand when I refilled my cooling system recently.