With new life long coolants your Renault system will inform you when your vehicle is due its coolant change (post 2006 vehicles) as these coolants provide extended life only when used in a clean system mixed with water. If mixed with ordinary antifreeze and/or old coolant in the system, the corrosion protection is reduced to that of normal antifreeze (2 to 3 years or 30,000 miles).
Long-life engine coolant (usually a 50/50 mixture of antifreeze and water) provides protection against boiling in hot weather and freezing in cold weather, with little or no service requirement.
All new vehicles also have longer intervals between fluid changes of all types partly because environmental regulators have pressured the manufacturers to reduce the amount of waste fluids that have to be disposed of or recycled.
Coolant can deteriorate over time and should be tested to see if it's still good, as it can be hard to tell just by appearances. Even if testing shows the cooling and antifreeze protection are still adequate, antifreeze can become more acidic over time and lose its rust-inhibiting properties, causing corrosion.
Corrosion can damage the radiator, water pump, thermostat and other parts of the cooling system, so the coolant in a vehicle with more than about 50,000 miles should be tested periodically. That's to look for signs of rust and to make sure it has sufficient cooling and boiling protection, even if the cooling system seems to be working properly. It can be checked with test strips that measure acidity, and with a hydrometer (we have all this equipment in our service centres) that measures freezing and boiling protection.
If the corrosion inhibitors have deteriorated, the coolant should be changed. The cooling system might also need to be flushed to remove contaminants no matter what the maintenance schedule calls for or how many miles are on the odometer.
On the other hand, if testing shows the coolant is still doing its job and not allowing corrosion, changing it more often than what the manufacturer recommends could be a waste of money so we will only advise at regular intervals and it is your choice to have it carried out with our Fixed Price promise.
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