Ken is right on the money as far as oil less goes. Try building a oiless truck engine that has aluminum cyl walls that are teflon coated and see how long it last I bought a oil less or "maintinence free" Sears Pro Grade 32 gal "5 HP" and it was so loud I was afaid the neighbors were going to call the cops. (Plus my wife always new when I had snuck out the the garage, ) As well as that the regualtor was flimsy plastic and you just about needed a wrench to adjust it. I took the unit back to Sears and bought a 60 Gal Campbel Hausfeld from Tractor Suply for around $400. Sears also lies about HP. Ask anyone in the electrical field Power=Volts x Amps Power in this case is in Watts and 1HP=712 Watts So if you look at the nameplate on the motor and do the Volts X Amps / 712 this will give you the actual HP that the motor oporates at under load ie... compresing air. The reason the Sears units are so noisy is they run a tiny motor at 6400 RPM instead of 1750 RPM that is why they wear out so fast. Just remember to drain the tank often with whatever model you choose! Take Care
