Originally Posted by PJC
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2. I have therefore blindly used the equivalent higher-performance Diesel in my Range Rover, however I have no idea what the B-number is and as Diesel doesn't have a RON I am beginning to wonder if there is a similar benefit in paying the extra for the allegedly better fuel. Is anyone able to assist me in understanding a little more about the make up and differences between regular Diesel and, say V-Power Diesel so I can make a more informed choice?

I only use Q8 Hi Perform (or Hi Q) Diesel in the Jaguar despite now costing over €2 a litre. My previous experience with the Alfa Romeo Crosswagon was that under acceleration with normal diesel there was an emmision of black fumes, presumably fine carbon particles (no particle filter back then), but with the Hi Perform Diesel the were no visible fumes.
It is highly subjective but I also think that there is a slight increase in power and a lower consumption. Certainly it burns cleaner. In fact I am surprised that legislation does not require the use of the cleaner, premium diesel in passenger cars.

Peter

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