Anti-Freeze for the Suzuki

 

Unable to locate the requisite ethylene glycol based antifreeze for the Suzuki Intruder, I was told by a grizzled old toothless tattooed bike shop owner that I should ignore the factory specs and just use the green automotive antifreeze.

 
I distinctly remember being warned against such heresy.   
 
What should I do?  Drink the Koolaid and use automotive antifreeze?