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Your cart is empty.4-Cycle Engine Lubricant Bottles and exclusively made in the USA the Opti-4 43121 10w40 34 FL. OZ. 4-Cycle Engine Lubricant Bottle is designed for 4-cycle engines and features an abrasion free run-in, dramatic surface improvement, lower operating temperatures, and lower oil consumption. The Opti-4's exclusive formula actually improves its lubricating ability as the engine works harder. Opti-4 is the highest quality petroleum engine lubricant available and is formulated specifically for the severe demands of power equipment. Opti-4 is a unique blend utilizing patented Eutectic additive technology for anti-wear characteristics combined with the industry's highest standard for anti-corrosion and thermal stability. Through the use of the Eutectic additive, Opti-4 extends the life of any 4-cycle power equipment engine by reducing friction, heat, and wear.