silkolene - mag or pro?

I was just about to order some Procool, but Sportsbikeshop only stocks magcool. I've read both spec forwards and backwards. They both seem to do the same thing. Does anyone know the real difference.

I was just about to order some Procool, but Sportsbikeshop only stocks magcool. I've read both spec forwards and backwards. They both seem to do the same thing. Does anyone know the real difference.

The real difference is the price!

Both will do the job

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https://www.sportsbikeshop.co.uk/#/27907,3203,1186

SCIENCE AND DEFINITIVE ANSWER ALERT

I emailed the manufacturer and got this reply:

"Main difference is that Pro Cool is Mono Propylene Glycol (MPG) based and Mag Cool is Mono Ethylene Glycol (MEG) based but they also have different corrosion inhibitor systems as well. In some cases both would be suitable however Honda recommend and MEG based coolant so we would recommend Mag Cool."

According to Monarch chemicals (and other sites):

"The main difference between propylene glycol and ethylene is the level of toxicity. Propylene glycol has a very low toxicity, which is why it is also found in cosmetics and personal care products, whereas ethylene glycol is poisonous and must be handled with caution to restrict any human or animal exposure.

So why not just use propylene glycol? There are a number of benefits using ethylene glycol over propylene glycol, especially in closed loop systems were risk of contact with food is minimal. For example, freeze point depression is much more effective using ethylene glycol – so more propylene glycol would be required to maintain the same freeze point as ethylene. As well as this, due to the lower viscosity of ethylene glycol it possesses excellent heat transfer properties."

So there you have it. Pro cool is less toxic, Mag cool works better. Mag Cool is what is in the manual. It should also be more efficient being lighter to push round. It reinforces my belief that you should never buy anything called "pro", because it won't be.