Ask Honest John

Most recently answered diesel engines questions
Does my six year old diesel BMW (which runs pretty smoothly) have any future at all? Or would you advise me to look for a non-diesel car?
I'm about to change my Nissan Qashqai Acenta diesel for something similar, but I'm concerned about getting another diesel with all the current issues surrounding diesel cars. Am I worrying unnecessarily?...
Should I have the update to my Audi A4 2.0 and, if so, why? I can see no benefit for me and only risk that it causes a future problem that Audi disown. I've refused the update so far.
I'm experiencing a lot less mpg, more noise, more DPF regeneration and less power since my car had the emissions update in August 2016. If you are in touch with Volkswagen engineers in Germany, can you...
I had the emissions fix on my 2013 Volkswagen Passat 180PS three weeks ago. My trip is now showing a consistent 7 per cent worse fuel consumption and the burner is coming on more than it has ever done...
My 2011 Hyundai i20 CRDi 90PS diesel has developed sluggish starting and oil splashed 3/4 way up the dipstick (checked after overnight standing). Coolant level remains normal. The engine has often cut...
I have just bought a new diesel Renault Captur. Have I made a big mistake not taking heed of government warning?
I'm thinking of changing my 2010 Mercedes-Benz E350 CDI for an E400 petrol or an E300 hybrid. I drive 6000 - 7000 miles annually, normally 20 mile journeys with occasional European trips. What is your...
I have 2010 FIAT Fiorino MultiJet. It will turn over with the key and will start if push started, but will not start with the key.
We are undecided between a Ford Kuga 2.0d, a Nissan Qashqai 1.6-2.0d and a Kia Sportage 2.0d. We would consider petrol if it was economical enough, or other diesel engines, though. We do a small amount...