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I know how the little wrench comes on the dash, and that means basically get your oil changed (A or B Class Service). Someone said if you get two wrenches that means your need the full service.

When do I get the belts changed, or the fuel and air filter changed or the spark plugs etc. Is this neccessary? I have had it for a little over two years and since have basically just got the oil changes, fluids checked, and brakes done.

I feel like I am losing some power though.

Someone let me know.

Thanks
 

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fuel filter should be changed every 4 yrs or60,000 miles there is an updated fuel filter for your ml its almost twice as long as the old one however mercedes has had a problem with fuel pumps and came out with an updated pump if you fill your ml up and the guage reads almost full instead of full its the fuel pump replace it as soon as possible or up your fire and towing insurance spark plugs every 50k your {sealed} transmission fluid and filter every 50k
 
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