Ask Honest John

Most recently answered premium fuels questions
Following your advice in the Telegraph to use Shell V Power or BP Ultimate Diesel I can, with certainty and experience, say it is the best thing I have ever done since taking ownership of an imported 2.5...
I run my 1960 Standard Vanguard using Miller’s VSP Power Plus as a lead replacement additive. I have now acquired a 1967 Triumph 2000 which has been run using Castrol Valvemaster Plus. Can I safely replace...
I am about to purchase a new Mercedes E220 ‘Executive SE’ saloon. I have read varying reports on supermarket diesel fuel and I am reluctant to fill up at my local supermarket. As an alternative, would...
We decided to take your advice and use Shell V-Power in place of supermarket fuel. When we started the trial, a petrol station attendant enthusiastically told us he had made an overall saving of 8 per...
I asked some months ago about the advantages of Shell/BP Premium Diesel and I followed your advice and use premium. One of my nearby Shell filling stations has changed to Texaco and Texaco Premium has...
I'm a bit confused as to which is currently the best fuel to use in my Volkswagen group 2.0 TDI CR engine. Could you please confirm which is now the best diesel fuel, or is there really no difference?...
Having read a number of car articles in the Daily Telegraph (yes, some of us in the "Colonies" do read material from outside our borders), I noted your advice in using high-quality fuels, not just for...
I read with interest a recent article you posted regarding supermarket fuel and thought I would share my feedback. Following your advice, after purchasing my Nissan X-Trail in 2004, I used only Shell or...
I have a clio 1.2Tce, in this type of engine (with turbo and compression ratio 9.8:1) can i get better mileage and performance using RON 98?
A few months back I persuaded my wife that it was good practice and worthwhile to fill the Nissan X-Trail with higher quality diesel, as although it was more expensive it would be better for the car and...