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24-03-2011, 22:37

The main difference as far as i know is the additives that shell ,esso, texaco ,ect put in their fuel ,they all have a secret formula .Carbon build up on the piston heads is much less with premium fuels (especially with diesels)

There is however a "urban myth" that supermarket fuel is sold so cheap because it is close to its sell by date .I know that petrol does lose some of its octane power with storage but i wouldn't imagine fuel is stored that long so i have no idea as to the validity of this myth

24-03-2011, 22:37	#9
martyh Guest Location: newcastle upon tyne Services: Sky Q silver bundle Sky Q 2TB box Sky Q mini box Sky fibre unlimited Sky Talk evenings and week Posts: n/a	Re: Is supermarket fuel good enough? The main difference as far as i know is the additives that shell ,esso, texaco ,ect put in their fuel ,they all have a secret formula .Carbon build up on the piston heads is much less with premium fuels (especially with diesels) There is however a "urban myth" that supermarket fuel is sold so cheap because it is close to its sell by date .I know that petrol does lose some of its octane power with storage but i wouldn't imagine fuel is stored that long so i have no idea as to the validity of this myth