Posted by MarkB_MI on November 09, 2022 at 02:54:57 from (96.59.224.67):
In Reply to: Coolant posted by Bob Bancroft on November 08, 2022 at 08:51:28:
If you're using non-toxic propylene glycol antifreeze, then a hydrometer intended for ethylene glycol won't work. But I doubt you're buying propylene glycol antifreeze; it will be labeled as such. And I don't know of any OEM who use propylene glycol as their factory fill. So I'd say you aren't getting an accurate reading from your hydrometer.
Does your hydrometer have little balls or a dial? In my opinion, the ball-type is inherently accurate: If the -10 ball floats and the -20 ball doesn't, is it good down to -10 or is it good down to -19? There's no way to tell. I pitched my cheap ball hydrometer and bought a dial one; it indicates my antifreeze mix is good to a lower temperature than the old hydrometer. If I had to check a lot of vehicles, I'd probably buy a refractometer like the one Reslls linked to.
Note that the 'straight' antifreeze you're buying now is probably not quite as strong as the old stuff. Antifreeze from the jug is never straight ethylene glycol; it is always slightly diluted, because straight ethylene glycol won't pour in very cold temperatures. I suspect manufacturers are adding a bit more water to the mix than they used to because water is cheap and glycol isn't. Also, it's possible the newer organic additive packages affect the viscosity in a way the old inorganic packages did not. (This is pure speculation on my part.)
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