Formulated to outperform passenger car/light truck oils, Amsoil synthetic small engine oil protects against wear, deposits and oil consumption in over worked, under maintained small engines professionals rely on to make a living. Engine dependability is vital to running a profitable business, yet most small engine oils we've tested are nothing more than re-labeled automotive oils, which are formulated with fuel economy in mind, not durability. That won't cut it. Compared to liquid cooled automotive engines, small engines run hotter, operate under constant load, generate more oil damaging contaminants, suffer from neglected maintenance and are exposed to dirt, rain, snow and other extremes. Simply put, they're far tougher on oil that most people think.