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  • FAQ – Frequently asked Questions

    What happens in cooling systems?

    On average, around ca. 150 liters of coolant are pumped around the cooling system of a car engine each minute, and commercial vehicles have a much larger cooling system. The mixture of water and coolant can come into contact with up to a hundred different materials. Unless the correct engine coolant is selected, the high temperatures and high pressure drop in the system create ideal conditions for rust and cavitation. Without any protection, the cooling water can etch deep holes into the metal and damage the cylinder head, cylinder liners and water pump. This can cause the cooling system to fail and can even damage the engine beyond repair.

    Motor manufacturers have very specific demands on the performance of engine coolants, depending on which materials they come into contact with. Glysantin® has been working in close cooperation with all leading motor manufacturers for many decades and has developed a suitable product for every engine.

    How does Glysantin® work?

    Glysantin® increases the boiling point of the cooling water to around 110 °C. Mixtures of water and Glysantin® can absorb more heat than pure water without boiling. Glysantin® is also very effective for preventing scale formation in cooling systems. Scale quickly tends to block the narrow channels in the system and prevents heat from being transferred to the ambient air. This can easily lead to overheating in the summer months. Glysantin® also performs very effectively as an antifreeze.

    Why are coolants colored?

    The color of the coolant is defined in the specification from the vehicle manufacturers and is also a small but important part of the official approval from the vehicle manufacturers.

    Important note: By the color alone, it is not possible to identify the engine coolant. The color of the engine coolant does not define the chemical and technical properties.

    Why do coolants have to be changed?

    Coolants have to be changed every three to four years depending on the product. This is important, because the additives contained in coolants are gradually broken down. Coolants retain their antifreeze action for a long time, but the corrosion inhibitors break down over time and no longer protect the cooling system from damage.

    More information on changing coolants.

    Should coolants be poured into the drains?

    No. Coolants are chemical substances and they often become contaminated after years of service in the cooling system. Pouring them into the drains is an offence against waste disposal legislation and is punishable by law.

    Should coolants be used undiluted?

    No. Concentrated coolants such as Glysantin® always have to be diluted. Undiluted products do not have sufficient capacity to absorb the heat from the engine, which leads to overheating. Undiluted coolants can also freeze in winter.

    More information on diluting coolants.

    In what proportions should Glysantin® products be diluted with water?

    When you are changing the coolant, we would always recommend that you dilute Glysantin® products with water at a ratio of 50:50 in order to obtain the best possible protection from corrosion, overheating and frost. The concentration of Glysantin® should be no less than 33 % and no more than 60 %.

    More information on diluting coolants.

    Can normal tap water be used to dilute Glysantin®?

    Normal tap water can mostly be used to dilute coolants if not harder than 3.5 mmol/l or contains chlorine etc.
    We recommend to use demineralized or distilled water.

    More information on diluting coolants.

    What happens when the wrong engine coolant is used?

    Mixing different engine coolants or using the wrong coolant can impair the performance of the special additive packages, and this can result in increased corrosion to the radiator. The passive layer in the cooling system gradually becomes thinner and more porous and the engine coolant needs to be changed at more frequent intervals. Using the wrong engine coolants can gradually lead to corrosion and damage to the water pump, radiator, radiator hoses and cylinder gasket. This can lead to engine failure in the worst case.

    How often do coolants have to be changed?

    Engine coolant additives such as the pH buffer are gradually broken down and become less effective with age. We therefore recommend a complete change of coolant every three to four years. It is also strongly recommended to clean the cooling system and completely renew the coolant whenever a repair is made to the cooling system. This prevents the rust, soil and suspended particles left behind in the system from causing scale, corrosion and other damage.

    How do engine coolants affect the motor manufacturer’s warranty?

    Officially approved engine coolants can be changed during the guarantee period without affecting the motor manufacturer’s warranty. However, filling the cooling system with unapproved coolant or antifreeze during the guarantee period can render the manufacturer’s warranty invalid.

    What are the advantages of coolants that have been officially approved by motor manufacturers?

    Motor manufacturers do not “recommend” any particular engine coolants, but they do grant official approvals. New vehicles are usually filled with approved engine coolants when they leave the factory and they can be replaced during the guarantee period without affecting the manufacturer’s warranty. On average, engine coolants have to undergo thirty different tests before they are approved by motor manufacturers. These mainly consist of various different corrosion and compatibility tests with the original components of the cooling system. Motor manufacturers do not give official approval to coolants until they have passed all the tests. The process takes three to five years and it is very expensive. The coolant has to go through the entire approvals procedure again every time a change is made to the formulation. Glysantin has the most approvals from leading motor manufacturers.

    More information on approvals.

    How long can Glysantin® products be stored?

    Glysantin® products have a shelf life of at least three years from the date of manufacture in their sealed original packaging. Its service life after it has been diluted with water depends on the vehicle manufacturer’s specifications. We generally recommend changing coolants every 3-4 years.

    More information on changing coolants is available here.

    Is Glysantin® harmful to health?

    Glysantin® contains ethylene glycol (ethanediol), which is harmful if swallowed. Contact with the skin and eyes must be avoided. Glysantin® must be kept out of the reach of children and pets. If you do swallow Glysantin®, you should seek medical attention immediately and show the doctor the packaging or label. You can also obtain qualified assistance by calling the emergency telephone number that appears on the Glysantin® packaging.

    Can I mix different Glysantin® products with each other?

    Glysantin® products can be mixed with each other, but we do not recommend this. Each product contains a different combination of additives that are compatible with the different materials in the cooling system. Mixing different additives can impair their overall performance and reduce the level of protection.

    Can Glysantin® products be mixed with coolants from other manufacturers?

    We do not recommend mixing Glysantin® products with other coolants. The formulations of different products vary widely, and mixing them can lead to severe compatibility problems.

    Can Glysantin® be used in other non-automotive applications?

    We do not recommend using Glysantin® products for any purposes other than those for which they are intended. Glysantin® products are developed and tested for use in automotive cooling systems. We do not usually have any information on using Glysantin® in other applications.