Sorry, but BMW unfortunately had have often problems with turbo-chargers, mainly in E46 with 4-cylinder-diesel-engines.
And very often the drivers couldnīt do anything against this, they drove the machine from start more softer before pushing it into higher revolution speed.
The chargers make in this case a very high fizzling-noise while driving,
this was the first indices for a damage charger - I hope, BMW will be
learn from this situation and avoid this for the future.
