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  Should I drop a gear to increase the revs on my Volvo S80 to clean the DPF on long journeys? 1 Feb 2017 (Ask HJ)
  I have a Volvo S80 D5 and regularly do long journeys but not at more than 3000 revs. Should I drop a gear to keep revs up to clean the DPF?
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  Does the Mazda 6 suffer from DPF problems? 25 Feb 2015 (Ask HJ)
  I am thinking of purchasing a five year old Mazda 6 2.2 diesel. I've identified a few for £7000 that have around 70,000 miles on the clock. Would you count...
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  Which chain cam camper van is less susceptible to DPF problems? 30 Nov 2013 (Ask HJ)
  If I were looking to buy a camper van with a chain-cam engine while also seeking to avoid potential DPF problems, what makes / models should I be considering?
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  Keeping my DPF healthy 12 Apr 2011 (Ask HJ)
  I am not a high mileage driver. How do I prevent problems with the diesel particulate filter on this vehicle?
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  Which efficient seven-seater? 4 Apr 2014 (Ask HJ)
  Should I buy a Fiat Doblo or a Citroen Berlingo Multispace seven seater for short trips around town?
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  Optional DPF? 15 Aug 2012 (Ask HJ)
  Is it true that the 1.6 HDi 90 engine on the Citroen C3 has an option for a DPF? If so would I be right in assuming you would recommend the one without...
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  Does the 2010 Hyundai Santa Fe have a DPF? 27 Jul 2010 (Ask HJ)
  Can you tell me if the 2010 Hyundai Sante Fe 2.2-litre has a particulate filter and, if so, might this be a problem?
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  Can a failed DPF regen cause oil contamination in the engine? 29 Nov 2016 (Ask HJ)
  My 2013 Mazda 6 diesel recently had a low oil pressure warning light come on. I stopped driving immediately and got towed to my Mazda dealer. They changed...
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  My high mileage diesel Hyundai i20 CRDi has developed a sluggish starting problem, is it time to get rid of it? 27 Feb 2017 (Ask HJ)
  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...
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  Congestion suggestion? 10 Sep 2011 (Ask HJ)
  I have been having a hell of a problem since April with a Skoda Fabia Estate diesel with a DPF, blatantly mis-sold to us and obviously "not fit for purpose"....
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  My Transit Custom has DPF issues but the garage can't find a fix, what can I do? 22 Dec 2023 (Ask HJ)
  I have a 2016 Transit Custom that is having repeated DPF issues. The garage clean the filter, and reset the code, but within 50 miles the van says the...
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  Mechanic says the oil level is high due to diesel in the oil sump from stopping DPF cycle. Is this possible? 20 Jul 2021 (Ask HJ)
  I've just had my Hyundai Tuscan serviced and, after 3000 miles checked, the oil level - which was about 2cm above the max line. I took it back to the garage...
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  Should I sell my 2007 Octavia Scout before the DPF fails? 23 Mar 2013 (Ask HJ)
  I bought a secondhand 2007 Octavia Scout TDI 1,968cc with 76,000 miles on the clock in May last year. It is my second diesel Octavia but the first with...
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  Had the emissions update and now the DPF is clogged. Can I get Volkswagen to fix it? 29 May 2020 (Ask HJ)
  I have a 2013 Volkswagen Beetle diesel. It went in for the emissions update but 12 months later, the DPF light came on. The car does very few miles per...
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  What's the average lifespan of a DPF? 26 Mar 2015 (Ask HJ)
  I have recently bought a four year old Volkswagen Touran 1.6 TDi with 17,000 miles on the clock and a full service history. The issue of DPF comes up...
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  Mazda 6 has DPF problem - should the dealer pay for the repairs? 12 Feb 2014 (Ask HJ)
  I bought a Mazda 6 (2006) from a used car garage in November 2013. Immediately after collecting the car there was a problem with it which, I brought to...
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  DPF ruining MPG? 7 Mar 2013 (Ask HJ)
  I've read and understand all your replies to the 'my car doesn't achieve what the official figures say', but I have had a shock on my recent change of...
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  I want a diesel car for my driving school without a DPF. What do you recommend? 3 Oct 2012 (Ask HJ)
  I am considering changing one of my driving school cars. Ideally, I would like to purchase a comfortable, quiet diesel car with a cam chain engine and...
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  Has Volvo initiated a software upgrade on the V50 R-Design diesel to assist with DPF regeneration? 10 Feb 2011 (Ask HJ)
  I apologise if I am boring you with this subject. I have been contacted by a local Volvo dealer who is aware that I am in the market for a new car and...
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  Are short journeys damaging the DPF in my SEAT Leon? 11 Jun 2010 (Ask HJ)
  I have a 57-plate SEAT Leon with a DPF filter fitted. I recently went to my local dealer as a warning light came on my dash. I left the car with them all...