After 7 years of oil changes we  know the Sage oil vac is the way to go. These units are low cost , low maintenance ,can take some serious abuse and still keep moving fluid. We currently have 7 sage units and hope to convert all of our units  to strictly Sage oil vac  units by 2009. The days of the waffer/diaphram  pump and ball crank are soon to be over, I hope. These units make a work day allot easier for sure. With a sage 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 WARRANTY , bumper to bumper.Please visit their site at www.Sageoilvac.com