Best Anti-Freeze

[CountrySquire55]

I use a 50/50 mix of Sierra anti-freeze and distilled water.

 

[3.6rs]

If you're running plain water in the summer, you have a self-propelled rust factory!

That's what I told several times (also on this forum). But apperently there are some folks who stick with plain water !

 

[katy]

Here's a chart:

 

[40 Deluxe]

I'd stay away from the orange antifreeze that GM used for some time.
It left clumps of corrosion in the system.

Yep. Dex-Cool. Nasty stuff!

 

[midgetracer]

Modern Antifreeze (ethylene glycol type) has added Silicates to protect the Aluminum parts common in modern engines. The companies now make an antifreeze for older cars that uses less Silicates. Silicates can drop out in older engines leaving a green goo or even a solid material which plugs water jackets. Heavy duty truck antifreeze has Nitrites as an additive that is an oxygen scavenger to prevent corrosion. Either of the heavy duty or the older car type is good for Model A engines. All antifreezes made with Ethylene Glycol are the same only the additive package in them are different.