Klotz Oil Snow X4 Estorlin Synthetic Lubricant - 0W40 - 1qt. KE840 Designed for the newest generation of 4-stroke performance snowmobile engines Specially formulated for cold start flow, thermal stabilty and reduced friction Estorlin technology is an advanced lubricity system that utilizes precision lubricating molecules to protect engine components from extreme heat and molecular shearing Exceeds warranty requirements of all leading manufacturers