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not normally most mercs have a chain timing belt so dont need doing its only need replacing if its worn which in most cases you can here a rattle from the engine dont let any one tell you they need changing every so many thousand miles as this is rubbish mine has 176000 miles and still has originall chain hope this helps
Switch ignition on and immediately press the button to the bottom left of the speedo (trip reset type button) TWICE !! Switch Ignition off Press and hold same button while switching ignition on. After 10 seconds a new interval will display followed by a beep. Release the button and switch ignition off. All done.
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