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You are playing w/ FIRE not changing your chain/rails/tensioner/oil line clips. So you save 500$, when one of the rails cracks and you jump time it's going to be 5K in repairs. Penny wise pound foolish. Waiting for a chain to make noise is not recomneded..I've had more then one car come in w/ jumped timing and never a peep from the chain before it let go.
In reality it's not so much the chains that let go, it's the 20 year old plastic guides cracking..but if you feel that your car is above the experience of countless techs and Mercedes engineer's that's OK.
Not sure who is doing your work but to feed a chain in and replace a tensioner will take about an hour..maybe. It's the rails that require time and effort.
Mercedes last because they have a rigorous maintenance schedule...not prescribing ot that schedule just lumps your car in to the 'just another old, worn out Mercedes' crowd.
Jonathan
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