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The car is run exclusively on V-Power Diesel/BP Ultimate/Esso Supreme as I find it runs very lumpy on ordinary diesel. That and the fact that with premium diesel economy goes up by around 10-15%.
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This implies that there’s always been a problem somewhere with the car. Premium diesel has always sounded just as bad as cheap diesel in my V60.
You really need an expert to look at live data from the car while this happens, as it could be one of many, many, things.