The wrenches are just your service interval advisor; Its good too have the Chains Tensioner looked at..
Deff pick up a manual on eBay. Especially if this is your first Benz. It will also advise you how too reset those wrenches...
Deff pick up a manual on eBay. Especially if this is your first Benz. It will also advise you how too reset those wrenches...