Coolant Concentrate G12++

SKU: 80132

Coolant Concentrate G12++ is an engine coolant concentrate (antifreeze) based on monoethylene glycol. This product employs the latest antifreeze technology which combines the benefits of both organic technology & traditional mineral (silicate) technology. Coolant Concentrate G12++ is suitable for use in both petrol and diesel engines and has been introduced to meet the demands of OEMs who favour this combination of organic & silicate technology.


  • Increased life time, allowing less frequent maintenance, thanks to the corrosion inhibitors which have a very low depletion rate.
  • Thermal characteristics that permit effective engine cooling without boiling.
  • Elimination of abrasives solids, resulting in better protection of the joints of the water pump.
  • Superior short & long-term corrosion protection through combined use of organic acid and highly stabilized silicate additives, especially for aluminium engines.
  • Environmentally friendly as free from borates, phosphates, nitrites & amines.
  • Protection against frost, depending upon the concentration chosen.
  • Excellent antifoaming characteristics.
  • Meets most European and International Standards.


Coolant Concentrate G12++ exceeds most of the European and International quality standards:

  • AFNOR NF R15-601 (France)
  • ASTM D3306 (USA)
  • ASTM D4985 (USA)
  • CUNA NC 956-16
  • SAE J 1034
  • AS 2108 (Australia)
  • ASTM D4656 (USA)
  • BS 6580: 2010 (UK)
  • FVV Heft R443
  • UNE 26361-8

The following OEM specifications are met by Coolant Concentrate G12++:

OEM OEM Standard
Audi TL 774 G (G12++)
Bentley / Bugatti TL 774 G (G12++)
Cummins CES 14603
Deutz DQC CC-14
Lamborghini  TL 774 G (G12++)
Liebherr Min LH-01-COL3A
MAN 324 Typ Si-OAT
Mercedes-Benz MB 325.5 / 325.6
SEAT TL 774 G (G12++)
Skoda TL 774 G (G12++)
Volkswagen VAG TL 774 G (G12++)


Coolant Concentrate G12++ is an extended life antifreeze which should be replaced every 5 years or every 250.000 km for passenger vehicles or every 1.000.000 km for trucks and commercial vehicles. Original Equipment Manufacturers’ (OEMs) recommendations should be followed when replacing coolant.

Typical properties

Parameter Value
Appearance Clear liquid, free from suspended matter
Density 1,119 g/cm3
pH (50% vol in water) 8,3
Freezing point (50% vol in water) -37,4°C
Boiling point 172°C
Reserve alkalinity (ml HCl N/10) 6,5
Water content 3,0% wt
Foaming characteristics at 88°C
            Height 35 ml
            Breaktime 1,0 seconds
Colour as dyed

The above properties are typical properties and do not constitute a specification, for specification limits please refer to the product specification.

Freeze Protection

Coolant Concentrate G12++ is a concentrated product and should be diluted for use with good quality water. TecLub recommends that for optimum performance distilled or deionized water is used. The freeze protection afforded by the various dilutions is detailed in the table below:

Si-OAT Coolant (vol %) H2O (vol %) Freeze Protection (°C)
33 67 -20
50 50 -40
67 33 -70

In order to provide a satisfactory level of corrosion protection it is recommended to use at least 33% (1:2) volume of Coolant Concentrate G12++ in the coolant solution. In line with most car manufacturers TecLub recommends a 50% (1:1) volume solution for optimum performance. For cold climates use 67% (2:1) volume, concentrations above 67% volume are not recommended and give no advantage.

Corrosion Protection

Protection from corrosion is the most important function of a coolant concentrate and is achieved by the inclusion of a well-balanced inhibitor package. In modern engines with the greater use of aluminium alloys and thinner section castings, avoidance of corrosion problems is critical. The inhibitor package of Coolant Concentrate G12++ is the result of very extensive testing which includes laboratory tests, simulated service tests, static engine test and field service trials. It successfully passes the FVV Heft R443 / 1986 test.

Coolant Concentrate G12++ provides extra protection of the alloys used in the cooling system of modern vehicles especially high-performance engines operating at higher temperatures than older vehicles. The tables below demonstrate the effective corrosion protection provided when tested against the industry standards such as ASTM D1384 (multi-metal corrosion in glassware) and ASTM D4340 (corrosion of cast aluminium alloys under heat-rejecting conditions).

ASTM D1384 (Glassware Corrosion, mg per test piece)

Test specimen MEG
(33% vol in H2O)
Si-OAT Coolant
(33% vol in H2O)
ASTM D3306 limit
Copper 6.5 0 10
Solder 345 1 30
Brass 8 1 10
Steel 1474 -1 10
Cast iron 2472 -2 10
Aluminium 30 1 30

ASTM D4340 (Corrosion of Cast Aluminium Alloys under Heat-Rejecting Conditions)

Mass change
ASTM D3306 limit
0.1 1.0


Coolant Concentrate G12++ is formulated to be able to cope with all water qualities and is compatible with hard water, however use of deionized or demineralized water is recommended. Coolant Concentrate G12++ is readily miscible with all engine coolants, however we advise not to mix organic additive-based products with traditional mineral containing coolants since optimum performance & longevity of service can only be guaranteed by using Coolant Concentrate G12++ exclusively.

Storage and Handling

Coolant Concentrate G12++ has a shelf life of minimum four years when stored in air tight containers at a maximum temperature of 30°C. Translucent containers should not be stored outside in direct sunlight, especially in warm climates. Coolant Concentrate G12++ can be stored in mild steel, lacquer lined or HDPE containers. As with any glycol-based engine coolant the use of galvanized steel is not recommended for pipes or any other part of the storage/mixing installation. Disposal of used or unused coolant must be carried out in accordance with local and national law, consult the material safety data sheet for further information.

Product sheet

Coolant Concentrate G12++

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