Forget the additives and use BP Ultimate Diesel or what ever version is available near you.
I have a 11 year old Ford Transit that I have had from new, last year I had to remove the inlet manifold to replace a pressure regulator on the pump. I was told while it was off it would be a good idea to clean out the inlet manifold as it would be full of crud from the EGR. To my surprise it was it was clean.
My van has run from new on BP Ultimate or what ever I can get, yes I know these fuels are dearer but if you are buying additives the cost of these is probably about the same if you use them all the time.
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