How often should the coolant in a Volkswagen car be replaced?
2 Answers
Generally, it should be replaced every two years or 40,000 kilometers. Coolant is a type of cooling liquid containing special additives, primarily used in liquid-cooled engine cooling systems. It offers excellent performance in preventing freezing in winter, boiling in summer, and protecting against scale and corrosion throughout the year. Precautions for using coolant: 1. Try to use the same brand of coolant. Different brands of coolant use different metal corrosion inhibitors, so mixing different brands is not advisable. 2. Most coolants have a validity period of two years (some products may last longer). When adding coolant, ensure the product is within its validity period. When replacing, drain the old liquid completely, clean the cooling system thoroughly, and then add the new liquid. 3. Avoid diluting with water. Traditional inorganic coolants should not be diluted with water, as this can cause sedimentation, severely affecting the coolant's normal function. Organic coolants can be diluted with water, but excessive water should be avoided. 4. For vehicles using coolant, never top up directly with tap water. Instead, use distilled or deionized water. If these are unavailable, boiled and cooled water is better than tap water. If coolant is lost due to leakage, replenish with the same brand of coolant. Coolant should be used year-round; using tap water in summer is not scientific and may do more harm than good. 5. Some coolants may develop small flocculent precipitates after being stored for a year, which is usually caused by additive precipitation and does not require disposal. However, if large amounts of granular precipitates appear, it indicates the coolant has deteriorated and should no longer be used.
Having driven Volkswagen cars for over a decade, I believe coolant generally needs replacement every two to three years. Especially for my Passat which often gets stuck in city traffic, high summer temperatures can cause it to boil and deteriorate. Coolant doesn't just prevent freezing but also protects the engine from rust. If not replaced when aged, it can clog water pipes leading to engine overheating and costly repairs. Once I delayed replacement for three and a half years and ended up paying over a thousand in repair costs. Now I've developed the habit of regularly checking for color changes - if it appears cloudy or has sediment, it's time for replacement. Volkswagen recommends using specialized G12 or G13 formulations to match the cooling system. Developing this simple biennial replacement habit saves hassle and money, prevents sudden breakdowns, extends vehicle lifespan by several years, and ensures worry-free long-distance driving.
