Automotive coolant is high in silicate and it apparently is too abrasive for motorcycle waterpumps, motorcycle coolant is anti silicate and thereby does not damage the cooling system.
I have absolutely no evidence to prove that the motorcycle coolant is any less abrasive than automotive coolant other than I have never had any cooling system issues myself, whether it is from the type of coolant I use or plain old luck. Motorcycle coolant is advertised as non-abrasive but one thing is for sure is that it is more expensive than auto coolant so maybe I am the sucker for advertising--we will never know:idunno:
by the way I didn't write the above article in case you wondered:rotfl::rotfl:
Yep, it's an American thing.
Antifreeze - Wikipedia, the free encyclopedia
"Traditionally, there were two major corrosion inhibitors used in vehicles: silicates and phosphates. American made vehicles traditionally used both silicates and phosphates. European makes contain phosphates and other inhibitors, but no silicates. Japanese makes traditionally use phosphates and other inhibitors, but no silicates. "http://en.wikipedia.org/wiki/Antifreeze#cite_note-findarticles-13