Ultimately, all diesel (or petrol) starts life as equal to all other brands. It is the additives that are put in to the fuel which for each brand are different. Total’s petrol tankers may for example fill up at the Esso terminal, but the fuel additives are different for each. The additives for the big boys: Shell, Esso, Total, Gulf, BP etc will be different from those for the supermarkets and of better quality
I was advised by an AA breakdown man to ensure that I filled up regularly with one of the premium brands so the engine had the benefit of the better additives. Especially in winter when cheaper unbranded diesel has a tendency to be waxy, which I found out to my cost one very chilly day!
I would not trust anything an AA employee says or does, all they know is how to plug a car in and read codes, when it comes to fuel, taxi drivers know where is good or bad.
Premium petrol is good, premium diesel is a con, though additives are not.
Buy your own quality additives, I alternate between system and injector cleaner and before the Mot or once in a while Forte DPF cleaner and a good hard run at high revs in a low gear. You have no idea what additives are used or if they are actually in it, buying your own you are sure you are getting it and not paying 10p a litre for it.
Running all the time with additives is not required, though it does no harm, once a month is more than enough.
It has to be really cold to have waxing problems, once in a blue moon, a small amount of petrol or kerosene solves it. It is kerosene that is added to diesel in winter I believe, so unless you had summer diesel in the tank it should not have been a problem. Far colder places than here manage.
Before the panic brigade get on the case regarding a tiny drop of petrol in diesel, watch this.
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