I've had excellent results using the suction gun and three quarts of fluid. During the process I turn the steering wheel back and forth several times. I can see the fluid clear up as I go along, particularly between quarts 2-3. The fluid stays clear for 20-25Kmi and I change it at 25-30Kmi.

I don't recall what the MB factory procedure for this job is. I believe either way will do the job. And the suction gun only requires one person which may be all that is available for some people.

HTH,

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Brian Toscano