This is a classic problem with these cars, we have had four in the family and only the c43 is good as it has a slightley different system, however the standard C,s have this problem and because it is an electronis set up there are no parts to lubricate.
The throttle linkage in mine was by cable and, where it ended up in the engine compartment there was a complex assembly of cams, springs and lever, plus another linkage down to the automatic gearbox.
Mine would also get stiff, and I could make it somewhat better (though never as good as I would have liked) by squirting engine oil into all the linkage pivots, over the cam face and into the cable where the inner wire goes into the outer sleeve.
Then I did the same on the accelerator pedal hinge pivots.
Welwyn Merx Limited is a family run business with genuine passion, dedication and 25 years of experience dealing with Mercedes-Benz and AMG passenger cars. Tel: 01707 395999www.welwynmerx.uk
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