I did my 2003 V70 D5 at about 100k miles and it was not half as bad as yours but still caked on about 5mm thick , the strange thing is that now at over 140k miles its not come back again just a little bit which I am leaving for the time being . On mine it made no difference to performance . I wonder if its anything to do with the type of engine oil or fuel used which causes more or less of the gunge ? I have always used the cheapest supermarket diesel and engine oil which you might expect to cause more problems due to being minimum specification or is it caused more by the engine not burning the fuel fully or even driving style ? I am not implying you are not driving properly by the way , but could it be due to a lot of stop start driving when the engine is not warmed up and just drinking the fuel through , on mine it takes at least 7 to 8 miles for the engine to warm up and and even then I doubt its fully warmed up to a steady state .
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