Motul Motocool Expert, Silicate Bomb for Your Waterpump?

[Süsser Tod]

Back in January 7 2012 I flushed the cooling system on my XT660R and changed the coolant as part of the 20,000km service.. I used Motul Motocool expert.

This year I had the mechanical seal on the waterpump fail. Noticed it in March, with 28,000kms.


For some reason today I ended up looking at coolants (boredom) and found this:

http://www.motul.com/us/en-US/products/140?f

Ready to use coolant (do not dilute) developed for all types of motorcycles: road, off road, quads… Nitrite free, amine free, phosphate free.

It does not say it is "silicate" free!

And then there is this other coolant:

http://www.motul.com/us/en-US/products/141?f

Ready to use coolant (do not dilute) for motorcycles. Nitrite free, amine free, phosphate free, borate free, silicate free.

They clearly list the "Factory Line" coolant as being silicate free, but not the Motocool Expert, that leads me to believe the Motocool Expert is in fact a silicate based coolant!

And that would explain why my waterpump failed after 8,000kms (5,000) miles with Motul coolant.

[Süsser Tod]

No one knows anything about it or has any long term experience with the stuff?

When I replaced the waterpump mechanical seal I replaced the year old coolant with more Motocool Expert. I'm afraid this waterpump seal will also fail because of the coolant.

[KustomizingKid]

If this is a legit concern go buy oem coolant and don't worry.

[strongbad]

If you look at the MSDS info, the two are definitely different formulas. The Motocool Expert lists Disodium Tetraborate Pentahydrate and Sodium Benzoate that Motocool Factory Line doesn't list. The Motocool FL has a much lower freeze point also. As to silicate, you can always do coolant analysis to find out or look around for someone else's coolant analysis. Or you can write the factory.

Keep in mind that you can ruin your seals with a coolant that has no nitrites, amines, phosphates, borates, or silicates, but has too much seal swell ingredients. I used Neo Keep Kool, which is similar to Redline Water Wetter in that it's not an anti-freeze. It reduces the surface tension of the water and lubes the pump. The Keep Kool swelled the seals excessively and when I got rid of the Keep Kool and went back to antifreeze, the pump leaked like a sieve. The Keep Kool even ruined the seal in the radiator cap.

[Idle]

Pentafrost SF is what I use with good results. (14,000 miles) 1/3 coolant 2/3 distilled water with two capfuls of water wetter. No colder than 30°F where I ride or live.
My bike never overheats or overflows, and has no cooling fan.

Never tried the motul coolant.

[Süsser Tod]

Silicate free coolants are not widely available in Mexico, even most motorcycle dealerships sell the Motul...

I'll look into Honda coolant for cars, I've found the Type2 is supposed to be silicate free and good for motorcycles.

[Foot dragger]

I use half and half green anti freeze and mineral free water,simple cheap and doesnt cause problems.

Its a trick I learned. The latest trickest most expensive stuff on the market,is unproven till its proved. I dont want to be their guinea pig.

Kinda like Lithium/Ion batteries,turns out they randomly melt in place on the bike,no thanks.