Mercedes 276 V6 petrol engine startup rattle

[355f]

Dear All

I have what appears to be a rattle on startup for abut 5 secoinds then all runs perfectly- no engine checklights.

Can any one suggest a speaciliast in Cambridgeshire please

[Panthro]

Is this on a C43?
I am almost sure that this will be the turbo wastegates. It's normal, nearly all of them make this noise and it does not affect the performance of the car or the turbos. My C43 did 75k with this noise. I had it checked by a Mercedes specialist and a turbo specialist and they said it was not a problem.

You can get replacement 3rd party actuators but not OEM as Mercedes don't sell the actuators separately. If you go down that route it will be a lot of work for nothing other than getting rid of the noise.

Here is a recording of my old car:

https://youtu.be/h0_vxMzGEds?si=rh76B_IuoBxb1w8x

[mwstewart]

Check the codes as there may be a pending code for cam adjustment.