Tdtj wrote:

A very interesting watch. I have used Tesco diesel for many years and different cars,never had any issues. However Tesco is very convenient for me also but I do drive a little further and use Costco as it’s a premium diesel and slightly cheaper than even Tesco prices. But now I may switch back decisions decisions

According to my fuel card supplier, Costco uses Texaco fuel. I use standard Shell diesel these days, as my bunker card makes it the cheapest diesel around, and is only ever matched by Costco prices.

I ran an Audi RS4 for almost five years on supermarket unleaded, and it never gave any issues. It probably had some timing retardation as a result, but I never noticed any loss of power. It still went like stink, still drunk the stuff and I was very happy with the smiles per mile delivered

For my petrol cars i add this to my supermarket fuel.

https://www.ebay.co.uk/itm/371939318400?mk...48QAvD_BwE overfinch modified