Hi, on the island I use Esso fuel in the Morgan but use supermarket fuels in the other vehicles, bear in mind the fuel on the island all comes from the same refinery, the difference being the different additives the various companies are prepared to pay for at the tanker loading rack where the additive is injected during the flow of fuel onto the truck, I can tell you that Costco use there own purchased package which is lubrizol technology and too expensive for the other hypermarmarkets to use. So a complete bargain and excellent fuel. You mention Redex which is largely an upper cylinder lubricant and not required in most cases but if you feel it does the car good then use it. I hope that helps.
