Is supermarket diesel as good as BP?

I run my Toyota Auris 1.6D on Sainsbury's diesel for two tanks and then two tanks of BP Ultimate. The car runs very well on both brands of fuel. I have been told that Sainsbury's fuel is supplied by BP and their diesel is the same as regular BP diesel? Do you know if this is actually true?

Asked on 3 September 2016 by Auto Steve

Answered by Honest John
If Sainsbury's offers superdiesel then supply logistics might mean it comes from the same depot as BP.
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