this maybe a long shot but what is the general consensus on v-power diesel, is it worth the money
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V power diesel is a strange thing - it's just got additives for cleaning the fuel system. This is how it supposedly brings improved performance and economy, by keeping your injectors clean. Any half decent fuel should do this though... personally I think it's just marketing using the V power name to create a 'premium' product. When I had a diesel I tried it but didn't see any benefits. But if you find improvements in economy which offset the additional cost, go for it.

Because diesel is compression ignition, you don't want it to have a high octane rating like petrol (which provides resistance to detonation). If I recall, diesel is generally only 15-20 RON. It is more usually rated by cetane content, which affects the delay and rate of ignition.