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Old 12-07-2006, 12:33 AM
MIKEWA MIKEWA is offline
Join Date: Oct 2006
Posts: 16
Question Zerex Dex-cool

ZEREX DEX-COOL antifreeze contains no silicates,phosphates,borates,
nitrates,amines. Is this ok to use in my 05 gg 300 ?
thank you mike

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Old 02-21-2007, 11:16 AM
42GEORGE 42GEORGE is offline
Join Date: Dec 2006
Location: orange county, ny
Posts: 60
Question why bother?

Has anyone here ever heard of EVANS NPGR "waterless" coolant, this stuff is amazing, it has boiling point of 400F degrees and is good down to -10F, and when it does go below -10 it actually shrinks instead of expanding. What else ? Well, it's good for 100,000 miles! So Evans reccomends draining it into a clean pan (no matter what color it comes out) and re-using it for 100,000 miles. It goes for about $38.95 per/gal but this will do 2-3 bikes depending on size & coolant capacity and its well worth it, especially for those on 4-strokes. Keep in mind that Prestone 50/50 boils at 276F degrees, and it boils before it boils over & this creates little bubbles in the jackets which makes "hot spots", Evans doesnt have any evaporative properties. Just thought this might help.

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Old 02-21-2007, 02:06 PM
GMP's Avatar
GMP GMP is offline
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Join Date: Jul 2006
Location: Jefferson Twp., NJ
Posts: 7,597
Thumbs up

EVANS is the stuff to use.
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Old 02-22-2007, 12:49 PM
jeffd jeffd is offline
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Join Date: Jul 2006
Location: Portland, Oregon, USA
Posts: 417

I have read you can go with a lower pressure cap when using EVANS. Given that, the need to switch to the higher pressure ktm cap is removed if you switch to Evans Coolant.

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Old 02-22-2007, 05:45 PM
Eric K Eric K is offline
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Join Date: Jul 2006
Posts: 546

I use the Evans coolant. It works very well, with no boil over issues even under the most demanding conditions. A few key things with the Evans coolant...

1) get all of the water out of the system before you use it.
2) allow room for expansion - do not fill the cooling system too high

I back the radiator cap off a bit to run at a lower system pressure.

Regarding DEX cool or any other coolant, NEVER mix different colored coolants in even small quantities as some of the combinations are very corrosive to aluminum.
Eric K
'06 GasGas EC300
'01 GasGas XC300
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