Mechanic In A Bottle for Gas & Diesel Fuel Systems . 24 oz 2 pack MECHANIC IN A BOTTLE: Fix and maintain ALL gas & diesel engines. This ultra-concentrated synthetic gasoline and diesel additive is for use in all gas, gas-ethanol blends, diesel, and biodiesel blends. Just pour in the fuel tank of any 2 cycle, 4 cycle, or diesel engine to help fix and maintain your cars, trucks, boats, tractors, small engines, and more. Use regularly to maintain PEAK ENGINE PERFORMANCE. Made in the USA.