'Oat' antifreeze

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Russell Jupp

Russell Jupp

New Member
Posts
242
Location
Devon
Hi all,
anyone know what 'oat' antifreeze is?
My local garage insisted it was used in my MGTF's and FL1 K series.
Obviously all share same motor, but why the use of this stuff?
Cheers,
Russ
 
Organic acid technology

Certain cars are built with Organic Acid Technology (OAT) antifreeze (e.g., DEX-COOL[11]), or with a Hybrid Organic Acid Technology (HOAT) formulation (e.g., Zerex G-05[12]), both of which are claimed to have an extended service life of five years or 240,000 km (150,000 miles).

DEX-COOL specifically has caused controversy. Litigation has linked it with intake manifold gasket failures in GM's 3.1L and 3.4L engines, and with other failures in 3.8L & 4.3L engines. Class action lawsuits were registered in several states, and in Canada,[13] to address some of these claims. The first of these to reach a decision was in Missouri where a settlement was announced early in December, 2007.[14] Late in March 2008, GM agreed to compensate complainants in the remaining 49 states.[15]

There are rumors that mixing DEX-COOL with standard green (non-OAT) coolant causes a chemical reaction that produces sludge in the cooling system. According to the DEX-COOL manufacturer, however, "mixing a 'green' [non-OAT] coolant with DEX-COOL reduces the batch’s change interval to 2 years or 30,000 miles, but will otherwise cause no damage to the engine."[16]

According to internal GM documents, the ultimate culprit appears to be operating vehicles for long periods of time with low coolant levels. The low coolant is caused by pressure caps that fail in the open position. (The new caps and recovery bottles were introduced at the same time as DEX-COOL). This exposes hot engine components to air and vapors, causing corrosion and contamination of the coolant with iron oxide particles, which in turn can aggravate the pressure cap problem as contamination holds the caps open permanently.[17]

Typically OAT antifreeze contains an orange dye to differentiate it from the conventional glycol-based coolants (green or yellow). Some of the newer OAT coolants claim to be compatible with all types of OAT and glycol-based coolants; these are typically green or yellow in color (for a table of colors, see [4])

quick GOOGLE SEARCH, and copied from wikipedia:rolleyes:
 
Organic Acid Technology

OAT anti-freeze is designed specifically for the protection of the aluminum system. It provides a microscopic barrier, a thin gaseous film, as protection for the system components. This film “bonds” to the aluminum surfaces it comes in contact with, providing protection against corrosion. When conventional anti-freeze is introduced into the system, this protection is washed away and chemical reaction corrosion begins almost immediately. Remember that the use of long life anti-freeze as a replacement for conventional anti-freeze does not extend the recommended system service requirements as set forth by the manufacturer. The “extended” life or protection ability of the long life coolants only applies to new vehicles in which the coolant is installed initially and then maintained by regular system service.

Organic Acid Technology includes such ingredients as sebacate, 2-ethylhexanoic acid (2-EHA) and other organic acids, but no silicates or phosphates (except in the case of Toyota's pink extended-life coolant, which adds a dose of phosphate to its extended-life OAT-based antifreeze). OAT-based coolants are usually (but not always) dyed a different colour to distinguish them from traditional blue/ green antifreeze. GM OAT-based Dex-Cool is orange. Volkswagen/Audi uses a similar product that is dyed pink. But Honda has an extended-life OAT coolant that is dyed dark green and does not contain 2-EHA.
The corrosion inhibitors in OAT coolants are slower acting but much longer-lived than those in traditional coolants. Consequently, OAT coolants typically have longer a recommended service life.
OAT corrosion inhibitors provide excellent long-term protection for aluminium and cast iron, but may not be the best choice for older cooling systems that have copper/brass radiators and heater cores. It depends on the formula.
 
The Mad Hat Man said:
Organic Acid Technology

OAT anti-freeze is designed specifically for the protection of the aluminum system. It provides a microscopic barrier, a thin gaseous film, as protection for the system components. This film “bonds” to the aluminum surfaces it comes in contact with, providing protection against corrosion. When conventional anti-freeze is introduced into the system, this protection is washed away and chemical reaction corrosion begins almost immediately. Remember that the use of long life anti-freeze as a replacement for conventional anti-freeze does not extend the recommended system service requirements as set forth by the manufacturer. The “extended” life or protection ability of the long life coolants only applies to new vehicles in which the coolant is installed initially and then maintained by regular system service.

Organic Acid Technology includes such ingredients as sebacate, 2-ethylhexanoic acid (2-EHA) and other organic acids, but no silicates or phosphates (except in the case of Toyota's pink extended-life coolant, which adds a dose of phosphate to its extended-life OAT-based antifreeze). OAT-based coolants are usually (but not always) dyed a different colour to distinguish them from traditional blue/ green antifreeze. GM OAT-based Dex-Cool is orange. Volkswagen/Audi uses a similar product that is dyed pink. But Honda has an extended-life OAT coolant that is dyed dark green and does not contain 2-EHA.
The corrosion inhibitors in OAT coolants are slower acting but much longer-lived than those in traditional coolants. Consequently, OAT coolants typically have longer a recommended service life.
OAT corrosion inhibitors provide excellent long-term protection for aluminium and cast iron, but may not be the best choice for older cooling systems that have copper/brass radiators and heater cores. It depends on the formula.
Click to expand...


Thanks for this.
 
I bought OAT antifreeze for my K series yesterday, from halfords. Bloody expensive stuff, cost me 45 euros for 7 litres. Got two litres left though as the bleeding went quite well.

Mechanic who worked on it before me put the green stuff in :doh:

It's only been about 10,000 miles since it was last done, but top hose split and wanted to get red stuff in asap so flushed and rebled the whole system.
 
[quote=freebiker;1025679]I bought OAT antifreeze for my K series yesterday, from halfords. Bloody expensive stuff, cost me 45 euros for 7 litres. Got two litres left though as the bleeding went quite well.

Mechanic who worked on it before me put the green stuff in :doh:

It's only been about 10,000 miles since it was last done, but top hose split and wanted to get red stuff in asap so flushed and rebled the whole system.[/quote]

Landrover main dealer price in UK is £8.30 per litre. Damned expensive when you find it in the passenger footwell. :mad:
 
JonFre said:
[quote=freebiker;1025679]I bought OAT antifreeze for my K series yesterday, from halfords. Bloody expensive stuff, cost me 45 euros for 7 litres. Got two litres left though as the bleeding went quite well.

Mechanic who worked on it before me put the green stuff in :doh:

It's only been about 10,000 miles since it was last done, but top hose split and wanted to get red stuff in asap so flushed and rebled the whole system.
Click to expand...

Landrover main dealer price in UK is £8.30 per litre. Damned expensive when you find it in the passenger footwell. :mad:[/quote]


I was quoted 14.80 euros per ltr by an LR garage in Villeneuf on saturday, so I bought 10 ltrs - just came up on the lottery:D:D:D:D:D
 
not orange - it has to be OAT! They contain 2-ethylhexanoic-acid or 2-EHA and other organic acids, but no silicates or phosphates. This formula gives longer life, thus replacing the short-lived silicates and phosphates. Many colours reside in this group. General Motor’s OAT-based DexCool is orange. Volkswagen-Audi has the same formula, but it is pink. Honda has one coolant dyed a dark green, which looks almost black when it is dirty. The corrosion inhibitors in this group are slower acting, but longer lasting. Five years, or 150,000-mile intervals are often recommended in this group of coolants.


rmg24pro - are yu a merkin?
 
why are people buying 7 and 10 ltrs of the stuff the td4 engin only holds 5.5 ltrs and you add water to the mix ,i hope you are not putting it in neat.
 
if you goto eurocarparts with discount code its £12 for 5ltr neat i have 3 k series engines and it has come in very handy it will mix to 15ltr
Ron
 
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