Servus, I bought a sl55 amg half a year ago and so far, 6000 km without problems. Recently he makes noises. It started when the vehicle is carefully warm and the engine has about 40 degrees oil temperature, a noise appears, which we hear a slight howling or after-running noise. Vibrations develop, which are noticeable on the steering wheel. Sometimes it is so that the noise then remains standing and sometimes is away again. The ntk pump has recently been changed to suspect. I suspect that the noise at the front is left, i.e. in the corner of the bipolar servo pump. Serve fluid has been checked and also something replenished. The noise occurs at the standing and driving vehicle. Is there any known problems with the servo pump? Could it be the pump or can it also be tapped on something else by remote diagnosis. Somehow, the problem first depends on a time period or a temperature dependence and as I said, if it occurs and the engine is restarted, it is sometimes completely gone. So I think it might also somehow have to do with the control unit. Next step might be to free the individual agregates from the drive belt and maybe drive without the pump. Error data wasn’t canceled. Would you have advised me? Many thanks in advance. Out. Best greetings Jumbosmall