Can't answer for diesels as I've never owned one.but a good few years ago I tried running a Senator I had at the time on the Shell super duper stuff[whatever it was called at the time] and the only difference I noticed was the fact I got less petrol for my £££s so I went back to using whatever was cheapest[as long I wasn't having to detour to get it] I've never had problems with fuel from a supermarket or any other source.Way back when petrol staion forecourts used to have a large can of Redex at the pumps which you could ask for when fuelling[yes people used to come out and put fuel in your car for you]so you'd ask for X gallons[or specify a money amount]and then Y number of shots of Redex at 1d a shot.
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