Use the correct tool and you can do all 6 cylinders...I got a write up here too which may be of some help
http://w124-zone.com/?p=122

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k