Flathead anti-freeze i.e. Zerok Dextron

I would stay away from any Ethylene Glycol product and use Propylene Glycol. E.Glycol will ruin any babbitt bearings and is death to animals. Sierra brand is a propylene glycol product.
 
I agree Sierra is the product to use in an old Ford where at least two things can happen, coolant comprimises oil in crankcase and coolant loss on mother earth.
 
Can you get Sierra at regular auto ts stores? Can't say I recognize the brand but am planning to winterize my car here in the next few days.
 
Sierra used to be in most auto stores but now seems harder to find when you need it. NAPA always has a couple dust covered jugs of it as it is few dollars more and most people don't want to pay extra, probably why Walmart and Meijers don't want it on shelves. Seems I have seen it at Andersons in Ohio. Websites say O'reilllys but one local never heard of it.:confused:
 
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