I have used the electric type but wasn't pleased with the quality and performance of the unit. Bought it off JCWittney's web site. Since then I bought a LiquiVac and am very pleased. It is a hand pump unit and is very stout. You can check it out at http://www.airpoweramerica.com. I have used it for both my 190D and 300SDL. Works great and makes oil changes easy. Add that to MBs top mounted filters, and oil changes can be done in your good clothes! Although my wife hates when I do that.