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Antifreeze.
Diluted with water, it is a "good oldie" solution to prevent the engine block from freezing and to prevent corrosion of your cooling system.
The only problem is that you MUST mix it in the right proportions (not everyone does that) and you have to mix it with demineralized or distilled water (and nobody does) and not with tap water!
Mixing with tap water means that a large part of the additives that the manufacturer has carefully selected have already been used before you start the engine.
You can buy antifreeze in the web shop of this site.
Coolant.
This is a ready-to-use liquid that you do not need to mix with water, nor should you mix with water.
The advantage of this is that you have better corrosion protection due to the more consistent quality and no chance of freezing.
So this is the better solution, but you have to replace this coolant every few years because its effect wears off.
Most of these coolants can be used interchangeably and mixed.
Long-life coolant.
Or organic coolant, this is something that has been used more recently and lasts a very long time (something like 10 years or more).
This is more expensive to purchase, but cheaper in the long run and it gives the best results.
You can usually recognize it by the popping color (often bright pink), which also gives a dirty brown color when you mix it with regular coolant.
That dirty color is also the intention because you should NOT mix it with other types of coolant.
Some manufacturers have already prescribed the new long-life coolant as standard for use in their engines.
If you fail to do so, the warranty will lapse. I think that says enough about the usefulness.
Using plain water is something you should only do in an emergency.
I know cases of heavy internal corrosion within 1 year on new engines using only water.
Never do this, except in an emergency!
You can buy coolant in the web shop of this site.
Anti-freeze effect.
The antifreeze components in a liquid will decrease over time, so that the engine is no longer protected against freezing. You can measure with an antifreeze meter whether there are still enough antifreeze dips in the engine that protect the engine from freezing. You can buy this meter in the Shop of this site
You can buy antifreeze meter in the web shop of this site.