Coolant Concentrate G12, 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:
|OAT Coolant (vol %)
|H2O (vol %)
|Freeze Protection (°C)
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, 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.
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 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
(33% vol in H2O)
(33% vol in H2O)
| ASTM D3306 limit
ASTM D4340 (Corrosion of Cast Aluminium Alloys under Heat-Rejecting Conditions)
|Mass change (mg/cm2/week)
|ASTM D3306 limit
Although it is always recommended to use deionized or demineralized water to dilute antifreeze, Coolant Concentrate G12, G12+ is formulated to be able to cope with different water qualities and is compatible with hard water. Coolant Concentrate G12, G12+ is fully miscible with other coolants and can be safely mixed with them. However, as Coolant Concentrate G12, G12+ employs an inhibitor type that is very different to that used in traditional mineral coolants it recommended to drain and flush cooling systems containing them before recharging with diluted Coolant Concentrate G12, G12+ . Failure to do so could significantly lower the performance and longevity of the product.
Storage and Handling
Coolant Concentrate G12, 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, 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.