10 replies to this topic

[oilman]

Coolant and antifreeze is a topic we are asked about on a regular basis, and often causes confusion; types, colours, service life etc.

Perhaps the most frequent cause of confusion is what the difference between anti-freeze or coolant is. Basically, they’re the same product (although the term “coolant” could just be applied to plain water; see below!)

To help clear some of the confusion up on the more technical details of antifreeze and coolants we enlisted the help of Martyn Mann – Technical Director, Millers Oils UK - who has provided the information below.

Not all antifreeze / coolant is the same!

Coolant can be plain water; water is a very effective coolant but would not protect against sub freezing temperatures or protect against corrosion inside the engine. The use of antifreeze protects against both problems.

Antifreeze not only suppresses the freezing point of your engine coolant, but provides good corrosion protection and increases the boiling point during use.

Most commercial antifreeze formulations include a glycol (to suppress the freezing point and raise the boiling point), corrosion inhibiting compounds and a coloured dye (commonly orange, green, red, or blue fluorescent) to aid in identification. A 1:1 dilution with water is usually used, resulting in a freezing point in the range of minus 37 °C to minus 42 °C, depending on the formulation.

There are two basic types of coolant available today dependent on the corrosion inhibitors used:

·inorganic additive technology (IAT)
·organic additive technology (OAT)

Inorganic Additive Technology

This is the traditional coolant based on inorganic additives and is called inorganic additive technology (IAT). It is a tried and proven chemistry that provides a fast acting protective film. The additives deplete and the coolant needs to be drained and replenished every couple of years. This type can be used on all mixed metal engines with components including steel, cast iron, copper, brass, aluminium and solder without any detrimental effect.

Organic Acid Technology

The newer OAT coolants work differently than the older silicate based IAT coolants. Aluminium and ferrous metals form a surface-layer of corrosion in the presence of moisture, even with the little bit of moisture in the air. OAT coolants prevent this metal-oxide layer that protects the surface against this corrosion. Inherent with their design, the OAT coolants last longer than the older traditional IAT coolants. This category of antifreeze cannot be used in systems containing yellow metals.

A couple of questions and answers.

Why are coolants different colours?

Coolants/antifreezes are coloured so you can visually see them; colour intensity can be an indication of over dilution. The different colours are non specific to the different types of antifreeze. The manufacturer can dye the product any colour they want. The colour is no guide to the actual type of antifreeze type and the label should be read before use.

What is best for performance use?

It is always best to use the engine manufacturer’s advice. If engine contains yellow metals [copper and brass as in older vehicles] then the long life products based on organic technology should not be used. As a general rule, most modern engines require the long life organic antifreezes.

Is there any advantage to using concentrate over pre-mixed coolants?

None other than the user may want to use the pre-mixed product due to ease of handling or cost and visa versa.

Can concentrate and pre-mixed coolants be mixed?

A simple answer is that you can, however do not mix IAT and OAT antifreeze together.

So, there we go. Hopefully this information has been useful, if you have any further questions not covered here please ask and I will try to get the answer.

With thanks to Martyn Mann and Millers Oils.

Cheers

Guy and the Opie Oils team.

[VXTyrant]

Thanks for the guide! So is the OAT coolant suitable for the VXT? I'm not sure what metals our engine's contain

[techieboy]

Yes. That's what the standard GM coolant is.

[2.2_na]

Another short thoroughly informative Oilman post.

[jayworth2]

A new question on this now is the next generation Glysantin G40 antifreeze / coolant suitable in our engines & cooling systems? As this is supposed to give better protection. I read that they can be compatible if mixed with G30

 

Edited by jayworth2, 15 March 2014 - 07:51 PM.

[Steelic]

Hmm. . . If I remember correctly the last TIme I replaced my Coolant Tank it was with a Vauxhall OE one with Brass fittings. What Detrimental effects do the OAT Coolants have when used with Yellow Metals?

Edited by Steelic, 16 March 2014 - 12:22 AM.

[Nev]

Oh dear, another guised attempt to drum up business, based on a rather trivial matter that really doesn't need so much science. The fact is you could put anything from sparkling mineral water to scrumpy cider in a coolant system and it would work adequately, both of which would be considerably cheaper. In fact I might use cider (and an Alcaseltzer to get the Ph down) in mine next time I fill it up and take a video of the temps just to drive the point home (though the first few miles might need the cap off!). Sorry to be so angry, but I find your postings on here which are designed to step around our "no professional advertising" policy rather annoying - repeatedly so.

Edited by Nev, 16 March 2014 - 08:16 AM.

[fezzasus]

Hmm. . . If I remember correctly the last TIme I replaced my Coolant Tank it was with a Vauxhall OE one with Brass fittings. What Detrimental effects do the OAT Coolants have when used with Yellow Metals?

None, they have a combination of corrosion inhibitors for both soft and hard metals, the difference is the corrosion inhibitors are ashless rather than typical borated corrosion inhibitors.

[Winstar]

The fact is you could put anything from sparkling mineral water to scrumpy cider in a coolant system and it would work adequately, both of which would be considerably cheaper. In fact I might use cider (and an Alcaseltzer to get the Ph down) in mine next time I fill it up and take a video of the temps just to drive the point home (though the first few miles might need the cap off!).

No it wouldn't, as well as the obvious "anti-freeze" effect of Elthyl-Glycol coolants they also increases the boiling point to over 120'C, without it your likely to boil the coolant.

[fezzasus]

 

The fact is you could put anything from sparkling mineral water to scrumpy cider in a coolant system and it would work adequately, both of which would be considerably cheaper. In fact I might use cider (and an Alcaseltzer to get the Ph down) in mine next time I fill it up and take a video of the temps just to drive the point home (though the first few miles might need the cap off!).

No it wouldn't, as well as the obvious "anti-freeze" effect of Elthyl-Glycol coolants they also increases the boiling point to over 120'C, without it your likely to boil the coolant.

 

 

You also have the effect of organic acids to consider if you use cider.

[Zoobeef]

Watched the WRC on saturday morning and they popped a rad hose and refilled it with beer as that was the only stuff the locals had to hand The raised pressure increases the boiling point too so depends on how hot you want to run it really. I use 2/3ds water to 1/3d coolant.