Yes the oil-less compressors are junk, and they will wake the dead, the compressor I'am using for sand blasting i'am not really sure what HP it really is. I'am using a pressure feed sand blast tank with a 3/8 nozzle for blasting large items and still have 90lbs pressure in the sand tank. The compressor is a V6 cummings diesel, 3 cyl for motor and 3 for compressor (special head) and puts out 210cfm at 110lbs, used 1200lbs of sand through it in 2 days and 5 gallons of diesel doing a complete frame, wheels and what ever else was covered in dirt and greese & rust
