Hi-Power FS Tech Semi Synthetic SM series actively protect the life of your vehicle and prolong the life time of the oil change compared to Economic series. Severe driving conditions can cause the buildup of thick, tar-like substance called sludge. Sludge can block your engine’s vital oilways like cholesterol – and if untreated it can rob an engine of power, and ultimately, its life. Hi-Power Double protection formula cleans way old sludge and protects against new sludge formulation better than tough industry standards. Hi-Power's proprietary additives make SM series one of the most advanced conventional oils, help protect the life of you engine with Hi-Power. Great for old and new vehicles.