COOLELF SI-OAT is a ‘very-long-life’ coolant made of monoethylene glycol. COOLELF SI-OAT has fast, effective protective properties. It provides a high level of protection against damage caused by freezing, cavitation, corrosion and overheating. COOLELF SI-OAT coolant is especially recommended for certain ICEs both for light vehicles (MB and VW group Euro 6 engines), heavy vehicles (MB, MAN, Scania and Cummins Euro 6 engines). public works machinery (Liebherr Euro 6 engines) and agricultural tractors (MTU Claas engines).