Вообще хотелось бы вернуться к типологии антифризов. Обычно на банках пишут G11, G12, G13 с разным количеством '+', но дело выглядит гораздо интереснее.
 
http://www.engine-performance-online.com/amsoil-products/amsoil-antifreeze/engine-coolant-antifreeze-types/#toc-inorganic-additive-technology-antifreeze-iat
 

Ethylene Glycol Antifreeze ( EG )
Conventional antifreeze formulations have been based on ethylene glycol since 1926 until around 2003 in factory fill GM automobiles.  The conventional antifreeze type is called IAT or Inorganic Acid Technology.  More IAT below.  The ethylene glycol antifreeze types usually contain several inorganic corrosion inhibitors to provide immediate corrosion protection as they maintain or buffer the pH of the solution.  Unfortunately, the buffers in this antifreeze type are chemically transformed or consumed as they function.  So as ethylene glycol antifreeze coolant is heated, cooled, exposed to air, components of the conventional ethylene glycol antifreeze additive package are depleted over time and the pH drops.  This corrosion and pH drop is why the ethylene glycol antifreeze type of engine coolant needs to be changed every two years or 24,000 miles.  The conventional ethylene glycol antifreeze formulations have been marketed as permanent antifreeze since they were introduced in the Vintage Car Era along with power steering and actuated brakes.  The conventional antifreeze allowed water-cooled automobiles to use used year-round but was further developed for higher boiling points providing advantages for summertime use as well as during cold weather.  Ethylene glycol antifreeze types are used today for automobiles and other applications because EG is less expensive even though it is poison.   The EG formulations are gradually being replaced by propylene glycol due to its much lower toxicity.
 
Propylene Glycol Antifreeze ( PG )
Propylene Glycol Antifreeze is extremely low toxicity compared to the extremely high toxicity of ethylene glycol.  It is allowed to be labeled “non-toxic antifreeze”.  Propylene glycol antifreeze is increasing in popularity die to the low toxicity and because many hybrid antifreeze brands are including it in their formulations.   Food processing and water pipes in homes and swimming pools are places where propylene glycol antifreeze are used.  Though controversial with organic consumers, the FDA allows propylene glycol as an ingredient in processed foods.  Propylene glycol oxidizes when exposed to air and heat, forming lactic acid, creating corrosion, also bacteria and biological fouling.  With propylene glycol antifreeze types, pH buffering agents are added to propylene glycol, to prevent acidic corrosion of metal components.
Due to the hydrogenolysis technology by Archer Daniels Midland Company, (ADM) propylene glycol (PG) is on its way to becoming a green chemical.  PG was traditionally produced from petroleum-derived propylene oxide.  However, ADM developed the proprietary glycols technology to use the catalytic process — hydrogenolysis — converting glycerin and sorbitol into propylene glycol.  Products as the result of hydrogenolysis include propylene glycol and water.  ADM’s separation technology meets industrial standards and United States Pharmacopeia (USP) excipient grades, therefore there is now a sustainable propylene glycol.  The times are changing.
 
 
Hybrid Organic Acid Technology Antifreeze Type (HOAT)
HOAT stands for Hybrid Organic Acid Technology, also known as G O-5.  HOAT is an extended life antifreeze type.  Hybrid OAT (HOAT) formulations are hybrid because additive packages contain ingredients from newer OAT ethylene glycol antifreeze types and the conventional ethylene glycol green formulas with nitrites added.  HOAT is compatible with both the ethylene glycol antifreeze.  HOAT is suitable for use in light duty and heavy duty systems.  But, HOAT is not to be confused with OAT, below, but usually is.   And, to be a HOAT antifreeze does not mean it is Dex-Cool, either, also below.   Though HOAT does eliminate antifreeze incompatibility since this antifreeze type is compatible with all antifreeze types and colors.   Some HOAT formulations contain recycled antifreeze.  Some are marketed as GO-5.  Normal HOAT antifreeze service life is 5 years or 150,000 miles (250,000 km).
 
Nitrated Organic Acid Technology (NOAT)
NOAT or Nitrated Organic Acid Technology antifreeze means an OAT antifreeze type with nitrates added.  NOAT is suitable in light duty and heavy duty systems.  The NOAT and HOAT antifreeze types are similar in performance characteristics therefore the NOAT service life also is 5 years or 150,000 miles.
 
 
Nitrite Molybdate Organic Acid Technology (NMOAT)
Nitrite Molybdate Organic Acid Technology (NMOAT) is familiar for wet sleeve applications.  NMOAT is often similar to heavy duty antifreeze formulations like Caterpillar and International.  NMOAT is also compatible with automotive OAT antifreeze types of engine coolant except it contains the fully-formulated attribute of nitrite and molybdate for diesel wet sleeve liner protection.
 
Poly Organic Acid Technology  (POAT)
Poly organic acid technology (POAT) is advanced antifreeze technology.   AMSOIL Antifreeze is POAT.   AMSOIL Antifreeze contains a proprietary poly organic acid technology.  It eliminates the need for supplemental coolant additives and recharging cooling systems. AMSOIL Antifreeze & Coolant provides extended service life in all gasoline and diesel vehicles.  It can be used for seven years or 250,000 miles in passenger cars, light-duty trucks, vans and recreational vehicles. AMSOIL POAT lasts seven years or 750,000 miles in over-the-road diesel trucks.  POAT is also for motorcycles, ATVs, snowmobiles and closed marine applications.  Note, AMSOIL Antifreeze and Engine Coolant lasts longer than conventional products.
 
 
Organic Acid Technology (OAT) or the DEX-COOL Antifreeze Type – GM Uses in Factory Fill Engine Coolant
The organic additive technology is the original extended life formulation.  OAT was introduced to reduce maintenance costs for consumers, downtime and environmental disposal costs and issues.  General Motors ( GM ) began using the new extended-life antifreeze, called Dex-Cool back in 1996.  Consumers became confused because the factory fill coolant contains a totally different kind of additive package called Organic Acid Technology (OAT) which is not HOAT or hybrid organic acid technology.  This says organic and they are, including sebacate, 2-ethylhexanoic acid or 2-EHA and other organic acids.  Silicates and phosphates are not included in OAT types of antifreeze though.  That said, one of the primary problems with OAT formulations is they are not compatible with conventional antifreeze types because the chemicals used in OAT antifreeze will react to some extent with some of the inorganic salts and other components in conventional antifreeze types (IAT).  OAT interaction generates cloudiness and precipitates.  OAT corrosion inhibitors are slower acting to provide protection over a longer period of time — five years or 150,000 miles.  OAT antifreeze factory-fill coolant is also used in 1996-and-newer Audi, Jaguar, Porsche, Volkswagen and Land Rover, 2001-and-newer Saab, and 1996-and-newer Toyota, Nissan, Honda, Mazda and other Asian makes.  The OAT antifreeze type provides protection for aluminum, but may not be the best choice for older vehicles where the copper/brass radiators have a lead-based solder.