Longest running, longest life! Patented full pressure lubrication provides instant lubrication to all vital bearings on start-up, minimizes noise with advanced piston, camshaft and gear technologies. Designed with low-pressure shutdown and a large automotive style oil filter. Electronically controlled voltage regulator gives peace-of-mind with electrical accessories. Belt Driven provides increased inertia, which allows for better air conditioner starting ability. Single-side serviceability. E.P.A. and C.A.R.B. certified.