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I have had my 20D M Sport for about 6 weeks and I am still trying to get used to how noisy the engine is. I am told that the X3 diesel is not as quiet as in the saloons. I have previously driven a 20D saloon and it was much quieter.
One thing I think makes a difference is fuel grade. I used supermarket diesel and the engine seemed noisier than it is when filled with a named brand. I have also tried Millers diesel additive which raises the Cetane level and improves combustion apparently.
I certainly prefer the sound of my 330i, but I am getting used to the diesel.
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