Ask Honest John

Most recently answered dpf questions
Is there any benefit in using Shell V-Power diesel in my new Octavia 1.6 DSG or is it intended more for high performance cars? I only do about 6000 miles a year.
I have been thinking of changing my Octavia vRS (petrol) due to my high mileage of 25,000 per year, and I am very wary of buying a manual due to DMF failure. I am lucky enough to have some money available...
My Jaguar regularly shows a red dashboard warning saying the diesel particulate filter is full. I'm told I should, at some point since the previous time it happened, have driven for at least half an hour...
I note on occasions your correspondents refer to the approaching 'Danger Zone' for expensive repairs to their (diesel) vehicles. I have owned a Toyota Avensis 2.0 D-4D for some six years, and - credit...
It looks as if KIA engines are chain cam, which I believe you recommend. Do you have any brief comments re petrol/diesel and or manual/automatic?
I have an old-school 2.0DTI in a Vauxhall Zafira. I have had issues with the EGR valve for about three years. Instead of having it replaced my local friendly garage "cleans" it and all is well, or was...
Various companies are advertising diesel particulate filter removal services with associated re-programming of the ECU to stop the CEL lighting up. My understanding is it is only an EU requirement to have...
My Ford dealer tells me that I should have completely changed the DPF oil at the 37,500 service. My village garage - who did the service - says that AutoData (where they get their guidance on service requirements)...
Could you explain such terms as DPF, DMF, CVT transmission, ABS, etc?
I'm on the hunt for an economical diesel estate with good performance. Is there anything that comes close to the performance/mpg/tax band/insurance group combination that one appears to get from the pre-2010...