AMSOIL offers three different coolants which protect against sludge/slime build up in a vehicles radiator. Radiator slime/sludge is a symptom of other problems in the cooling system usually cause by low quality coolants. It is a fact that almost 40% of engine failures are due to cooling system issues involving the radiator. This article talks about sludge and slime in a vehicles radiator. And how it’s usually caused by using low cost coolants and can cause severe engine damage.