I read about that a while back when I was researching making bio-diesel. IIRC, the first anti-freeze back when was made from glycerin and glycol came in later as it was apparently cheaper. I'd much prefer using a non-toxic variety. On the several occasions when I had a coolant leak in a heater core, and the subsequent sickly sweet smell of anti-freeze, I wondered about what breathing those fumes might entail.

I gave up the idea of making my own bio-diesel when it dawned on me that I'd be paying myself maybe $5 an hour for my work and would have a part of my shop all greased up. Unless I really geared up and made enough to sell a good portion also.

__________________
1986 300SDL, 362K
1984 300D, 138K