Why would Mercedes allow to use the suction method in their MB dealerships if it did not work as well as the "old fashion way"?
I use the suction method and the answer to the question above convinced me of changing the method I used in my car. Afterall, they designed the cars and I am sure there was some testing by MB BEFORE they authorized dealerships to use the suction method.
Bottom line, use whatever work better for you. It is your car.:p

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J.H.
'86 300E