Thread: Red VS Green Coolant again!!!

Originally Posted by isuzurover

Ethylene vs Propylene Glycol | Heat Transfer Fluids | The Dow Chemic

I don't under stand this if you are comparing the 2.

"acute oral toxicity" is not "OAT" organic acid technology.

Originally Posted by Roverlord off road spares

I don't under stand this if you are comparing the 2.

"acute oral toxicity" is not "OAT" organic acid technology.

Not sure what you are trying to say?

Rick and others brought up PG-based coolants - such as Cummins. PG based coolants are a 3rd technology. I was simply showing a comparison of EG-based coolant vs PG-based coolant.



Quoted again with the important parts highlighted:

Ethylene vs. Propylene Glycol

Early in your fluid selection process, you should consider what local requirements might impact your choice. Local regulations or a specific application may require that you decide between the use of an ethylene or a propylene glycol-based fluid.

In most heat transfer applications ethylene glycol-based fluids are your best choice because of their superior heat transfer efficiency. This efficiency is largely due to the lower viscosity of ethylene glycol solutions. Another benefit of this viscosity advantage is lower power consumption for re-circulation pumps and a lower minimum operating temperature. DOWTHERM™ SR-1, DOWTHERM 4000, or DOWCAL™ 10 fluids are EG based fluids.

Propylene glycols are most commonly used in applications in which low acute oral toxicity is required, or for freeze protection where incidental contact with drinking water is possible. In some areas, use of propylene glycols is required by local regulation. Propylene glycol-based fluids are used extensively in food processing applications, but ethylene glycol-based fluids can also be used in some instances. The ingredients in DOWFROST™ and DOWCAL N inhibited propylene glycol-based fluids are generally recognized as safe by the U.S. FDA1. Since these products also have the appropriate approvals, they can be used in immersion freezing of wrapped foods and other food applications where ethylene glycol is not permitted. See Food Product Chilling/Freezing. Generally Recognized As Safe (GRAS) by the US Food and Administration, propylene glycol based DOWFROST can be used in immersion of freezing wrapped foods and other applications where ethylene glycol is not permitted. DOWFROST HD, DOWFROST, DOWCAL 20 fluids are PG based fluids.

OAT and EG-based coolants are basically the same, just that you should not mix them. PG and EG coolants can be mixed.

Originally Posted by LandyAndy

Hugh.
CAT do a premixed OAT coolant,around $120 for 20LT from Westrac.
Ive been running CAT coolant in both my TD5s for a while now.No issues at all.
Andrew

The CAT OAT is the same Texaco based OAT coolant (with a couple of supplemental additives) as used OE by Land Rover.

Rick,

I'm in Townsville. 27 and 1 hour behind you. It's too early for this.
Go to bed.

Hahahahaha.

Bill

Originally Posted by isuzurover

Ethylene vs Propylene Glycol | Heat Transfer Fluids | The Dow Chemic

The slight downside of PG coolants.

Not sure if I mentioned it earlier, but OAT's have a heat transfer ability better than silicate based (conventional) coolants, roughly half way between silicate based coolant and straight water.

HOATs, the latest technology, are somewhere closer to OAT's than conventional coolants.

Originally Posted by isuzurover

Not sure what you are trying to say?

Rick and others brought up PG-based coolants - such as Cummins. PG based coolants are a 3rd technology. I was simply showing a comparison of EG-based coolant vs PG-based coolant.



Quoted again with the important parts highlighted:



OAT and EG-based coolants are basically the same, just that you should not mix them. PG and EG coolants can be mixed.

disregard my post........to late for me to read and comprehend

So we are 65,000k down the road and the green coolant is doing very well. I have an injector that isnt and lost compression over time in one pot because of it - washing the oil off the bore. So Im putting in a 97/98 P38A 4.6. It would have had green coolant as standard as did my 95 D1 3.9. Im going to continue to use green.

The D1 had a brass and copper raditor. The D2 went to alloy. Thats the only difference in components that I can see that would warrant thinking hard about going to green on a D2 - otherwise hoses, water pump etc are all the same.

My alloy radiator is showing no signs of problems or gunge, so I am happy to keep up the green coolant. It never runs hot so heat transfer bla bla is just not an issue.

Cheers

I have read every post on this old thread and am still none the wiser. I have to take the head off my 300 D1. it has green in it now. Should I keep it green? I was going to use Scania pink, as I have access to it, but now I'm not sure. Caltex orange is another option I have available. Both claim compatibility with all materials, including alloy, various types of seals and hoses and copper.
If green, then what about Castrol Radicool? It's readily available, and comes as a 33% premix.