Hello, at the WE at my C20xe have changed the towing belt! Complete with rollers and wapu. Now after the first correct ride I noticed a very strong noise towards Wapu. The noise is only in idle speed and when the engine is warm to hear! As soon as I raise the speed by 100 revolutions the noise is no longer heard. Also when the engine is cold, the noise is not present. Did everything disassembled again and so on. But not found anything! umpe in suspicion, but can this be that only scrapes when it is warm? Oil pressure and performance are absolutely normal! Have no idea anymore!!! Greetings