After 7 years of oil changes we  know what unit works. These units are low cost , low maintenance and can take some serious abuse and still keep moving fluid. We currently have 9  units and hope to convert all of our units to this design by 2010.  These units make a work day much easier for sure. With this unit I can evacuate 4 quarts of oil through the dipstick in 3-4 minutes. The upkeep is minimal and the UNIT HAS A 2 YEAR GUARANTEE,   bumper to bumper. Please give us a call if you would like a price list of the machinery we use.