Mobil Heavy Duty Coolant?

Rocket Scientist said:
I bought mine at a Honda shop, it's not supposed to have any silicates. I've read not to put even "low silicates" in our bikes due to it causing water pump seal failures.
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Funny thing is,I did have a water pump seal failure at 30000klms using the Mobil coolant from the dealer. Probably got a bad pump,dealer said it was unusual to fail at that mileage.
 
Rocket Scientist said:
I bought mine at a Honda shop, it's not supposed to have any silicates. I've read not to put even "low silicates" in our bikes due to it causing water pump seal failures.
Click to expand...

On Triumph's website in the 2011 R3T owner's manual it recommends HD4X coolant (HD indicates "heavy duty"). I found two other companies who offer that: Aztec Oils and Petrochem Carless. Both state that it contains silicates and nitrites. I've read elsewhere that the most important factor is whether coolants that contain silicates also contain a silicate stabilizer. Silicates are supposed to be important to prevent cavitation in aluminum engines. I also think that if Triumph believed that OAT coolant was preferable to HOAT it would make that change now on its website. HOAT mainly differs from OAT by the former offering special anti-corrosion additives, which can include silicates and nitrites. The bottom line for me is that I am going to use Mobil Heavy Duty but I don't know enough about this subject to recommend that for anyone else. If I was closer to a Triumph dealer I'd buy Triumph coolant.
 
Here is what is in the Owner's Manual:

A year-round, Hybrid Organic Acid Technology (known as Hybrid OAT or HOAT) coolant is installed in the cooling system when the motorcycle leaves the factory. It is coloured green, contains a 50% solution of ethylene glycol based antifreeze, and has a freezing point of -35°C (-31°F).
 

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My understanding is that any "long life" anti freeeze will be good as they do not contain silicates. I heard the same thing as Fred that any silicates will harm the water pump seals and should be avoided.Why take the chance?
 
@TO rocket
Agreed - I shall get mine at the neighborhood Honda motorcycle shop because it's closest to me.
 
Whichever coolant we use the most important qualification is probably that it meet ASTM D6210, which is the standard for heavy duty coolants.
 

After some further research I've decided to follow your lead and use Zerex G-05. As you state, it's HOAT. It's also ASTM-D6210 compliant and it contains low level silicates and nitrites (which IMO is a good thing). Valvoline has always been a quality manufacturer.
 
Just bought a liter of HD4X coolant from the dealer (blue bottle) to add to my bike. When I opened the bottle, I found the color to be blue? The bike came from the factory with clear coolant (the kind that marks it's territory with a white stain). I assume it is safe to mix the two different colors of HD4X together?
 
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