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I must agree with Pottsy. The oil majors spend massive amounts on R&D to develop the additives that they add to fuel and lube oils. So yes, go with the likes of BP and Shell. I tend to prefer Shell Diesel Extra, because Shell doesn't mark its price up as BP does with Ultimate. Although they are now going that way with V-Power diesel.
Having said that, I've used V-Power diesel a couple of times and it's knocked the socks of Ultimate in mpg. However, two tankfuls isn't enough to make a real comparison.
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