Hmm, then open the Yellow Pages and see how many cylinder head reconditioning workshops are there, go and see one and check out how many heads are corroded there. Then, take my advice and change that coolant every 3 years even if they say it was a lifetime fill (we all know what that means - usually 5years/120,000km), you can stretch the first coolant change to 4 Years in the VAG car. But ofcourse if you keep your car only 3-5 years do nothing about the cooling system.
Honda, Toyota, Mazda coolant life is 8-10 years and I didn't hear that their cooling systems corrode. However VAG cooling system is often topped up and that IMO reduces the life of the coolant greatly, plus often the w/pump needs replacing sooner, or if fitted with the timing belt the w/pump will be replaced at the same time (most likely). So in reality the VAG coolant stays in the engine less than 5 years when engine has the timing belt, but now it could be up to 7years before the coolant is changed. So, I would definitelly change it at the 4th year.
Changing the coolant every 3 years may void the cooling system leaks, it could save your engine if/when overheated because of the leak. Corroded coolant connectors and radiators cost more than the cost of the coolant change.
Honda, Toyota, Mazda coolant life is 8-10 years and I didn't hear that their cooling systems corrode. However VAG cooling system is often topped up and that IMO reduces the life of the coolant greatly, plus often the w/pump needs replacing sooner, or if fitted with the timing belt the w/pump will be replaced at the same time (most likely). So in reality the VAG coolant stays in the engine less than 5 years when engine has the timing belt, but now it could be up to 7years before the coolant is changed. So, I would definitelly change it at the 4th year.
Changing the coolant every 3 years may void the cooling system leaks, it could save your engine if/when overheated because of the leak. Corroded coolant connectors and radiators cost more than the cost of the coolant change.
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