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The air filter and dust filter are 2 different things. They are both easy to do. The engine air filter is under the hood behind the right (passengers side) headlight.
The climate control dust filter is under the dash on the passengers side, you just need to remove the dash-colored panel under the dash in the passengers side footwell to do it.
The spark plugs aren't too hard to replace on the ML, there are 2 per cylinder, so you need twice as many plugs as you have cylinders.
The fuel filter can be a harder job because the ML fuel system and filter underwent a modification a little over a year ago. The original filter is no longer available from MB, the new filter is longer. The fuel lines were also changed and need to be installed to complete the modification. In order to do this, you need to access the top of the fuel tank, which requires removing the drivers side (left side) of the rear seat. Then the carpet is lifted up in this area and a glued down lid is removed, I use a heat gun to soften the glue to allow easy removal and reinstallation of this lid. Once the lid is removed, the lines to the in-tank pump can be removed and the new lines installed. This was all done to change the plumbing of the fuel. The return fuel from the regulator is now ran through the filter once again, they belive that this extends the fuel pumps notoriously low life span. I have to admit I haven't been replacing as many fuel pumps lately!
Gilly
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