Originally Posted by MaestroAl
All diesels have injector cleaner in them and they're all low sulphur now too. No diesel in the UK will damage your engine over any length of time. Still, that being said, I tend to put a tank of posh in around 1 in 10 ... just for good measure
I'm not sure anyone is thinking damage, but causing damage and assisting longevity are not the same thing.
Premium fuels typically have a higher dosage of cleaning detergents and lubricity enhancers.
ULS diesel was the cause of a lot of injection equipment failures when first introduced, as sulphur has lubricity properties. Hence why products like Millers were used by many diesel users to combat the lubricity defficiency.