Is it worth paying more for premium diesel?

I have tried using premium diesel, in my 69 Reg Mercedes-Benz A-Class AMG Line Premium. It works out expensive compared to ordinary diesel, even after taking into account the marginal increase in MPG. Would more frequent use of diesel treatments, like Forte, which is used at every service, give smoother and better fuel economy at lesser expense than premium diesel? I clock anything up to 15,000 miles annually.

Asked on 4 January 2023 by Allan Dattani

Answered by Lawrence Allan

Premium diesel doesn't actually boost the octane rating like premium petrol, so the economy benefit will be slight (if at all). Its main benefit is keeping fuel systems clean of soot deposits, but as you already use it regularly and the car is quite new this is unlikely to be a big issue. Diesel treatments again are largely focused on cleaning. If the cost is an issue then we'd alternate tanks between regular and premium diesel.

Tags: premium fuels diesel cars

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