Ask Honest John

Most recently answered diesel engines questions
In September 2016 I bought a Porsche Macan S diesel. The claimed mpg by Porsche is 46.3. Obviously I did not expect to get anything like this but my normal experience with other cars, the last an Audi...
I've got a 2008 Kia Sportage that ran out of diesel. I've changed the diesel filter and bled the fuel. Primed the pump but it's still not starting. It's turning over for a bit but the turn over dies down...
My Mercedes-Benz ML270 CDI (2004) is a bit sluggish when starting up from cold in the morning - it's only just started happening. I have to press harder on the accelerator to get the car going which is...
I have a 2009 Volkswagen Golf 2.0 TDI. The EGR has just failed for the sixth time and my local dealer has just quoted me over £1600 for the repair. The last time it failed was just over two years ago but...
I have a 2007 Jaguar X-Type 2.0 diesel manual. It only has 38,000 miles and drives fine with no funny noises or handling issues. Lately it has shown an odd starting problem. When it's cold after standing...
My budget is around £6000- £6500 and I'm looking for a reliable and economical used car. I do around 10,000 miles a year. What would you recommend between the Honda Civic 2.2 diesel (2007-2010 model) or...
I have bought a 2007 Volvo XC90 Geartronic D5 and plan to use it to tow a caravan, with a maximum weight of 1545kg. Is it advisable to change the oil cooler to prevent gearbox overheating?
You answered a question on 13 December about VAG emission changes. including this: "Latest on the 'fix' for 2.0 TDIs is that it increases the revs at which peak torque is developed by 300rpm and that...
I have a 2009 BMW 320d Sport. Can you tell me if it has a cam belt or chain? What do I need to check for maintenance?
My three year old Range Rover Evoque 2.2 diesel has started to make a very loud "clattering" noise when I start it in the mornings. The noise goes away after 20 - 30 seconds and settles down with normal...