Hmmm not so sure.
BM z4 coupe - 40K miles mainly on sainsburys super. No problems, went like stink.
330msport 45K miles mainly on sainsburys super. ran brilliants, no problems went like stink
VW Scirocco 25K miles, remapped, decat pipe etc mainly on sainsburys fuel, no problems, went like stink and produced stupid amounts of power at the RR days compared to others and was nice and quick down the 1/4
e350 Cdi convertable - ran mainly on sainsburys disel, no problems, chipped, went like stink
ml320 sport - 65K miles ran mainly on sainsburys diesel, no problems, pulls like a train. (it might even have had a tank of v-power petrol in it at one point but thats another story)
Above when I say mainly I mena 90-95% of the fuel is from sainsburys. So I am failing to see when these problems are going to arise?
Don't believe the hype... I am sure there is a marginal performance gain from the shell v-power, and if I am passing a shell I will put the stuff in my amg, but as for the others knackering my engine I doubt it. But if I post up on here that my cars gone bang because of cruddy fule I will happily let you tell me "I told you so"
These cars are not just sold in the uk, germany etc they are sold in countries with cruddy grade fuel.