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  Freezing conditions 22 Dec 2010 (Ask HJ)
  Is it better to leave a 10 year old Skoda frozen, as it has been for 4 days so far, or to start it and let it run for 30 minutes or so? If so, how frequently?...
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  How do all-season tyres perform on motorways? 31 Jul 2010 (Ask HJ)
  I drive approximately 12,000 miles per year in a 2004 diesel Astra, 30 per cent motorway miles and the rest on country roads and lanes. The tyres are due...
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  Why does my Peugeot 406 lose power occasionally? 17 Jul 2010 (Ask HJ)
  I have a V-reg Peugeot 406 HDI 110bhp with 176,000 on the clock which is well maintained. At random times it loses engine power when running and the speedo...
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  Will a 1997 SEAT Alhambra be more economical than our R-reg Ford Galaxy? 10 Jun 2010 (Ask HJ)
  I own an R-reg Ford Galaxy GLX, 2-litre. I want something a little cheaper to run, as I do two one-and-a-half-hour school runs a day through town. Will...
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  Let this be a warming 28 Feb 2009 (Ask HJ)
  My BMW 3-Series is not heating up. Would you have any idea what the problem is?
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  We do mostly short trips with some caravan holidays. Would a diesel hybrid suit our needs? 16 Jun 2020 (Ask HJ)
  At the moment we have a 180,000 mile diesel Volkswagen Golf for the short runs we do and a 60,000 mile diesel Honda Civic Tourer for the long runs and...
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  If I have a puncture in a runflat tyre, do all four need replaced? 17 Apr 2020 (Ask HJ)
  I check my tyre pressures each week and have discovered a very slow puncture on one of my BMW 320i front tyres. They are BMW-approved run flats. I know...
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  Is there a defeat device in my Porsche Macan as with the Volkswagen EA189 engine? 17 May 2017 (Ask HJ)
  I have a 2014 Porsche Macan 3.0-litre diesel, bought new. It recorded 42mpg or better on a long run and 39mpg average on short urban runs. Porsche wrote...
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  Why is my Peugeot 208 using so much coolant? 7 Dec 2016 (Ask HJ)
  My Peugeot 208 1.4 petrol runs at around 96-98 degrees and the engine is using a lot of coolant every week. I've called out the AA, but they say this operating...
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  What's the best method for running-in a new EcoBoost? 23 Nov 2016 (Ask HJ)
  I'm due to collect my new Ford with the EcoBoost petrol engine. Do new cars still have a running-in period? Is there anything to be careful of with this...
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  Why did our Volkswagen Transporter lock itself shut with the engine running? 5 May 2012 (Ask HJ)
  My son owns a 2005 Volkswagen Transporter T28 TDI. On a Friday morning at a temperature of -8 degrees centigrade, he started up to warm the interior and...
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  Dedicated foreigner to fashion 5 Oct 2011 (Ask HJ)
  As a retired former senior executive in the car industry, the most refreshing aspect of your column is the even-handed way you dispense advice on customer...
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  Consumed by consumer 30 Jul 2011 (Ask HJ)
  How meaningful are the published Official Fuel Consumption Figures? A friend of mine has a 9-month-old Vauxhall Astra. He has run three tests, over a distance...
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  Can you recommend a good replacement for our AWD Fiat Sedici? 12 May 2011 (Ask HJ)
  My wife has a 5-year-old 1.6 petrol engined Fiat Sedici with 30,000 miles which has been an excellent buy with absolutely no running problems, just regular...
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  How should I drive my Citroen C5 diesel in order to avoid potential DPF problems? 5 Sep 2010 (Ask HJ)
  A couple of months ago, I bought a secondhand 2007 Citroen C5 2.0 HDi auto. This is obviously a rep's car, given the 72,000 miles on the clock. Again,...
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  Hyped and seek 10 Apr 2010 (Ask HJ)
  I am thinking of buying a 2nd hand Toyota Prius but almost all the driving I do is on the motoway - usually between London and Wales. I have been driving...
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  Filter tip - DPF regeneration 15 Jan 2010 (Ask HJ)
  I've run a BMW E60 525SE petrol auto from new. It's 6 years old and I intend to change it for a new F10 5-Series. There are compelling paper reasons for...
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  Stop starve technology 5 Dec 2009 (Ask HJ)
  I am really interested in the Vauxhall/Opel Ampera. The benefits seem inescapable. However, given a scenario where the car is used on the daily commute...
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  Are run flat tyres best for dealing with pot holes? 23 Jan 2024 (Ask HJ)
  I read with interest your reply to the reader who enquired about best tyres for potholes. My BMW 320i has 225/45R18 which are runflats. I have always assumed...
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  Do I need to let the engine idle after a long journey? 16 Dec 2020 (Ask HJ)
  I have a Kia Rio that has a turbocharged engine. I was always told that after a long journey you must keep the engine running for a minute or two (in order...