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  How often do I need to take a DPF-equipped diesel for a long run? 9 Mar 2013 (Ask HJ)
  We are looking to buy a diesel estate but have had conflicting advice on how often you have to take them out for longer, faster drives to avoid problems...
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  Will my new warranty cover the DPF? 29 Jan 2013 (Ask HJ)
  My Volvo XC60 2.4D Automatic [20,000 miles] will be three years old in March. I am about to take out a two-year extended warranty with "Warranty Direct". I...
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  New Mazda6 likely to have DPF issues? 17 Aug 2012 (Ask HJ)
  I have owned a 2002 model Mazda 6 2.0 litre diesel for 96,000 miles. Never any trouble. I commute to work and use the car for business so almost every...
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  Using the right oil to prolong DPF life 16 Aug 2012 (Ask HJ)
  Please can you advise your readers to make sure the correct spec oil is being used in thier cars. I have a shiny 2012 Subaru Outback [Diesel]. Both...
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  I am thinking of buying a diesel car. either honda civic or toyota avensis dated before DPF fitted. 5 Jul 2012 (Ask HJ)
  I am thinking about buying a Honda Civic or Toyota Avensis diesel car dated before the fitting of DPF. I am concerned about the Dual Mass Flywheel and...
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  Can I remove the DPF from my Renault Laguna? 4 Jul 2012 (Ask HJ)
  I have been having problems with the DPF on a Renault Laguna diesel. I have had it regenerated twice and now someone has suggested having it taken out....
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  BMW diesel particulate filters 29 Apr 2012 (Ask HJ)
  My BMW 525 diesel ( 04/54 ) has now covered 73,000 miles mainly around town with occassional long runs and the service computer is showing 90,000 miles...
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  The Someday Smut 22 Apr 2011 (Ask HJ)
  Can you tell me what a particulate filter does and why and how often they need replacing?
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  No particulate place to go 5 Feb 2011 (Ask HJ)
  I am changing my car this year (2006/56 Mercedes E280CDI with 30k miles) and am considering either Jag XF, BMW X3 or perhaps another Merc. My concern is...
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  Do I drive enough miles a year for a diesel? 12 Jul 2023 (Ask HJ)
  I'm looking to buy a Citroen C3 Picasso, it's a 2015 diesel, and I was worried I may not do enough miles in it to keep the DPF healthy. I'll be doing about...
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  I didn't know short runs could damage a diesel car - should I change my diesel Mazda 6? 4 Jan 2018 (Ask HJ)
  Although I really like my diesel Mazda 6, I had no knowledge regarding the DPF i.e. short runs not doing it any good. Are there any other cars with as...
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  I want a 2007 diesel Honda CR-V for towing - will there be heavy tax penalties on old diesels? 8 Mar 2017 (Ask HJ)
  I cover about 10,000 miles per year, mostly journeys of 50+ miles. I need a 4x4 to negotiate muddy/slippery tracks and to tow a trailer. I'm looking at...
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  Can I remove the DPF from my Jaguar XF? 4 May 2013 (Ask HJ)
  I have a Jaguar XF 2.7 Diesel and probably do too many short runs for the diesel particulate filter, averaging only 8000 miles a year. So far the light...
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  Buying a used medium sized diesel - what would you recommend? 8 Apr 2013 (Ask HJ)
  I am looking to buy a medium sized diesel without DPF. After reading too many internet forums I am now unable to decide what to plump for given that there...
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  Thinking of buying a secondhand diesel - when did DPFs and DMFs appear? 21 Apr 2012 (Ask HJ)
  I am driving a 2004 Ford C-Max 1.6 diesel which is giving excellent service and fuel economy. I will keep it for a year or two longer, but I wonder about...
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  Will the Hyundai i30 make a good driving school car and will any DPF problems be covered by a warranty? 21 Jan 2012 (Ask HJ)
  I recently asked for advice on the best car for a driving instructor, and one of the recommendations was a Hyundai i10. I dismissed this as having no student...
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  Why is my Vauxhall Combo van losing power? 5 Sep 2010 (Ask HJ)
  Please could you advise what to do about a new Vauxhall Combo SE 1.3 van I bought in May 2010? It is hesitating and losing power, and our local dealer...
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  DPF questions 25 Nov 2012 (Ask HJ)
  I am buying an Alfa Romeo Giulietta diesel. The dealer says that the DPF problem is lessened on this car as it is higher up the exhaust system. Is that...
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  I tried to safely assist my Ford Galaxy's passive DPF regeneration - is my engine okay? 22 Mar 2017 (Ask HJ)
  I've recently purchased a 2011 Ford Galaxy 2.0 TDCi. After the local Ford dealer changed oil and all filters they advised me to (as the car was immobile...
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  Does our Mercedes-Benz C220 diesel need a new DPF? 15 Jan 2017 (Ask HJ)
  We have had a 2004 Mercedes-Benz C220 CDi automatic diesel in Spain for the last 10 years. All was fine until a week after its annual MOT last May, when...