premium fuels | Ask Honest John

Ask Honest John

Most recently answered premium fuels questions

Can I use standard unleaded in my 1990 Mini Moke?

I have just bought a 1990 Mini Moke, but the dealer is not sure if the cylinder head has the hardened valve seats to use unleaded petrol. Do you think it would be okay to use unleaded? Also, should I use...

Is the diesel fuel that I buy in a supermarket any different from Shell or BP?

Is the diesel fuel that I can buy in a supermarket filling station really any different that the diesel that I can buy from a Shell or BP garage?

What's the best quality petrol and diesel to use?

What is the best premium fuel brand for petrol and diesel?

What fuel grade should I run my Toyota Celica on?

I have a 1992 generation 5 Celica Convertible imported from Japan many years ago. I notice that when driving up an incline it seems to 'pink'. I have not heard this before from an injected engine. Which...

Is an engine flush necessary for a year old car?

I have a year old SEAT Ibiza coming up for its first service, with 6500 miles completed. The SEAT garage have asked if I would like an engine flush as it 'improves mpg etc'. I am of the opinion that one...

Apart from premium fuel, how do I stop my direct injection petrol engine becoming clogged?

I've recently bought a Toyota Auris with the 1.2 turbo petrol engine (and am very pleased with it so far). I intend to keep it for a good long time; at least 10 years, ideally. I understand that direct...

I stopped using premium fuel and got a huge dip in fuel economy - what do you think caused this?

I have an Hyundai Ioniq, which I've run exclusively on Shell fuels for the 5000 miles that I've had it. I was getting 60-62 mpg on the regular stuff, then put a tank of the V-Power in and got 64 mpg. I...

Should I use Shell V-Power in my 1.2 Puretech engine?

I have Vauxhall Crossland X 1.2T 130PS and intended to use Shell V-Power fuel to keep the components as clean as possible. After reading the owners manual, it recommends 95 Ron - 98 Ron. As Shell V-Power...

I'm getting a 'risk of filter clogging' warning - what do you advise I do?

I have a 2011 Peugeot Partner which has just started displaying a 'risk of filter clogging' warning. I took it for a run on the dual carriageway, but it hasn't made any difference.