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  Shell V-Power 16 Jan 2013 (Ask HJ)
  I recently saw A Fifth Gear test on super fuels like Shell V Power. The conclusion was that benefits were minimal. Some forums also claim that any improvements...
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  Best run flats for BMW 5 Series 10 Jan 2013 (Ask HJ)
  Having just had my second tyre blow out at high speed on a motorway, I'm looking to replace all 4 run flats on my BMW 525i Touring with the latest generation...
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  Audi A6 Particulate Filter warning light 17 Dec 2012 (Ask HJ)
  The particulate filter warning light came on two days ago. I read the manual which suggested running the car in fourth or fifth above 2000rpm for 15 minutes...
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  Anti-pollution fault 10 Nov 2012 (Ask HJ)
  My Peugeot 308 has “System states: anti-pollution system fault” and engine light showing when I start the engine. Everything is working fine and the car...
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  Winter tyres - what to do? 5 Oct 2011 (Ask HJ)
  I have a 2006 56 model BMW 520 d SE Auto which I plan to keep for two winters. They are now on 225/50 run flats on 17 inch alloys. 1. Do I just fit...
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  Check Emissions warning 28 Sep 2011 (Ask HJ)
  I have a continuous warning for check emissions although the car is running fine. My local independent garage ran a diagnostic check & came up with a...
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  Do you find bright daytime running lights to be a distraction? 30 Jul 2011 (Ask HJ)
  I am concerned that BMW, Audi, Mercedes and Ford appear to compete with each other to see who has the biggest and brightest daylight running lights. I...
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  What does the 'Service transmission' warning light mean in a Volvo V50? 12 Jul 2010 (Ask HJ)
  I have recently purchased a 2006 Volvo V50 D5 automatic with a high mileage at 118,000. It runs ok but the service transmission light and engine system...
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  De-hyundrated 10 Jul 2010 (Ask HJ)
  I have an April 2009 Hyundai i10 Comfort automatic returning 22-30 mpg. My dealer says this is because the engine is still tight (only 1,400 miles to date)...
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  Repent ye simmer 19 Jun 2010 (Ask HJ)
  You have mentioned several times that its a good idea to let a turbodiesel cool down before switching off after a long run. I recently bought a Skoda Yeti...
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  All down hill 25 Jan 2010 (Ask HJ)
  An article in yesterdays paper that recommends, "Never coast in neutral; idling uses more fuel than running in gear on a closed throttle.” I don't understand...
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  Fan always runs on my 406 18 Jul 2012 (Ask HJ)
  Radiator fan is contstantly on on my Peugeot 406?
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  Insurance and modifications 10 Aug 2011 (Ask HJ)
  I have fitted running boards, do I need to inform my insurance company?
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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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  Bio Diesel for newer cars? 15 Aug 2010 (Ask HJ)
  I bought a Cadillac BLS 1.9 Wagon in January. £15,772 for an all singing all dancing car with Sat Nav bluetooth seemed like good value. I have now covered...
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  Which small FIAT is cheap to run? 23 Aug 2012 (Ask HJ)
  Enforced early retirement has meant the company BMW 520d has gone and we need to economise, but I still want something with a little bit of "oomph". I...
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  Does the Audi Allroad 12.5 TDI engine have a history of injection pump failures? 7 Jul 2010 (Ask HJ)
  I have had diesel cars for over 20 years and never had a pump failure until recently. In Jan 2009 I bought a 2005 Audi Allroad 2.5 TDI. In Dec 2009, one...
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  Daytime Running Frights 7 Nov 2009 (Ask HJ)
  My new Mazda 6 TS2 has daytime running lights and since buying the car 3 months ago I have had four scary encounters where cars joining from side roads...
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  Air conditioning 4 Aug 2012 (Ask HJ)
  Should air conditioning be left on all the time?
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  Is it normal for my van to take a long time to warm up? 29 Apr 2020 (Ask HJ)
  My van runs well and is very economical, however, it takes a long time to warm up and never reaches the normal mark on the temperature gauge. Is this a...