Originally Posted By: Trav
Your missing the point. Coolguard II is not G48 or a G48 clone according to John Deere.
How can it be if it has no 2eha.
This from John Deere, It cant be any clearer.
Originally Posted By: John Deere
we do not use 2-EHA in or formulation of either the former Cool-Gard or the current Cool-Gard II. The OAT used in Cool-Gard and now in Cool-Gard II, along with the two additional OAT's in Cool-Gard II, are unique and proprietary to Deere, and are not used by anyone else. That makes Cool-Gard II a truly unique and one-of-a-kind formulation."
I put this in every old iron, mixed iron/aluminum and all aluminum engine with copper and aluminum heater cores and radiators alike with no issues after 6 years.
Its still clean as the day i put it in.
2eha is no problem with engines designed for Dexcool but in older engines i wouldn't want this plasticizer in the coolant.
Claiming that Coolguard I is GO5 may be close but that Colguard II is G48 and not as safe in an older engine is patently false.
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The two John Deere coolants are G-05 and G-48 respectively.
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G-05 is the safer of the two for a retrofit to a vehicle originally using something else.
Both Coolguard formulas are both equally safe. I do agree that putting G05 in and older engine is probably safer than G48 but that has nothing to to with Coolguard or Coolguard II.
X2.
Just my own personal experience here on one vehicle, but what I have found is that Coolgard II can be used safely in a G-05 system, and even mixed with G-05 with no ill effects.
I have been using G-05 and Coolgard II in my Ranger's cooling system for 5+ years now. I can't remember exactly when I first bought Coolgard II for it, but it was around 2009 or 2010. I have never bought the first version of Coolgard...it had been superseded by Coolgard II by the time I first bought it.
I have only ever done drain & fills on the radiator, no total flushes ever done. I have replaced two cooling system components in the life of the truck...one heater hose with a common failure point for these trucks, and the t-stat/gasket/water neck, another common leak point. Neither had anything to do with the coolant...they are simply known leak points on 3.0 Rangers. The heater hose failed at 11 years/146K miles. The t-stat had a minor leak from 70K with paper gaskets, and seems to finally be solved with a Felpro PermaDry silicone gasket in a plastic frame. Either way, not coolant related. The first t-stat gasket leak was on the original fill of G-05, before Coolgard II had ever been put in the system.
When I have had the t-stat off to replace the paper gaskets, the inside of the intake manifold has always been spotlessly clean. Like eat off it clean. The water pump is original at 151K miles. The cooling system is totally up to par no matter the outside temp. The temp sender has been occasionally erratic lately, but that is almost certainly an old age failure and again, not related to coolant. I'll know for sure when I pull it for replacement, but given the condition of the intake manifold, I don't expect to find any buildup. The hoses have never actually broken down...the leak on the heater hose was at a plastic t that cracks when it gets old and brittle and must be replaced as a whole assembly.
Temp has always been steady, and no leaks from the non-paper gaskets in the system. Reservoir is clean and clear.
I would guess that the coolant mix in my truck is around 2/3rds G-05 and 1/3rd Coolgard II currently. It is among the cleanest cooling systems I have seen, it has just had common leaks for this model/engine, and minor ones at that. No problems related to the ability of the coolant to do its job cooling/preventing freezing/providing protection or gunk buildup in the system.
I would think if G-05 and CoolgardII could not be mixed together, I would have seen much worse things going on. In my experience, they are totally compatible and safe to mix.
