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  No fuel like an old fuel 31 Jul 2010 (Ask HJ)
  Several weeks ago, I accidentally put 20 litres of unleaded into my 9 year old, 93,000 mile 1.9D Renault Kangoo. I immediately filled the rest of the tank...
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  Vapour trial 30 May 2009 (Ask HJ)
  I am looking for a large 4x4. Having read reviews including your own I am drawn to the VW Touareg 3.0 diesel but to get the spec I want I need the Altitude...
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  What are the advantages of hybrids compared to petrols and EVs? 30 Oct 2023 (Ask HJ)
  Can you tell me please the advantages of buying a self charging petrol car over a straight petrol engine car or full electric car?
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  Which fuel should we use in our petrol Fabia Estate? 18 Jul 2022 (Ask HJ)
  We run a 2012 Fabia TSI Estate with a 103bhp petrol engine and we hang on to our cars until they give up the ghost. Could you please tell men what grade...
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  What are the drawbacks with DPFs? 1 Dec 2017 (Ask HJ)
  What are the drawbacks with particulate filters?
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  Buying used executive car - 5 Series or XF? 20 Feb 2016 (Ask HJ)
  I am looking to upgrade from my diesel Ford Mondeo and a 2012 BMW 5 Series or 2011 Jaguar XF are favourites. I want a refined, comfortable cruiser, with...
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  Why is the fuel consumption on my 308SW so high? 21 Dec 2013 (Ask HJ)
  I run a 2009 Peugeot 308SW 1598cc petrol. I have been very pleased with it, apart from the fuel consumption which has never exceeded 40mpg even on a long...
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  Should I idle my Mercedes-Benz C180 after running to allow the turbo to cool? 17 Aug 2013 (Ask HJ)
  I read about problems with turbos, in particular from not letting the engine tick over for a few minutes to cool down after hot running. These all seem...
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  Fun, cheap to run, practical car for £8k? 30 May 2013 (Ask HJ)
  I am currently looking for something cheap to run that fits in the fun good-looking category. I drive around 10,000 miles a year, so for the outlay and...
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  Why does my insurance company require my V5C two years running? 23 Mar 2013 (Ask HJ)
  Last year I received a letter from my insurer threatening to cancel my policy if I failed to send them a copy of my V5C within seven days. I complied and...
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  Should I buy an ex-Olympic fleet BMW 320d? 26 Jan 2013 (Ask HJ)
  I am seriously considering the purchase of a high spec BMW 320d auto saloon F30. The car is eight months old, has covered 1300 miles and is an ex-Olympic...
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  Am I driving my diesel correctly? Will it last? 13 Jan 2013 (Ask HJ)
  I have read your articles for many years and have taken particular note of your advice regarding using diesel engined cars for regular short runs - as...
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  In-law manifold 29 Dec 2012 (Ask HJ)
  One of your readers letters extolled the virtue of running older cars. Like you, I remember when I was young and had little money. I ran old cars and can’t...
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  Running-in and fuel consumption 17 Mar 2012 (Ask HJ)
  I have just bought a petrol engined car for the first time in more than 10 years as my annual mileage is now only around 12,000. I exchanged my 59...
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  Suitable for the chairman 10 Sep 2011 (Ask HJ)
  Back in the early 1990s, with a growing family, we bought the cheapest people carrier around then, a Mitsubishi Space Wagon. It coped with 4 children on...
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  Is the 85ps FIAT 500 TwinAir a real alternative to the 500 1.4? 27 Oct 2010 (Ask HJ)
  I want to buy a FIAT 500 and decided that the 100PS 1.4 engine should provide the kind of performance I am looking for. FIAT has now produced the 85PS...
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  What's the minimum annual mileage I should cover in my Land Rover Freelander 2 to avoid DPF problems? 16 Sep 2010 (Ask HJ)
  I notice that you have mentioned the need for new diesel vehicles to do a yearly minimum mileage when fitted with a particulate filter. The other week...
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  Is our BMW 530 DSE suitable for use as our only car, including short shopping trips? 9 Sep 2010 (Ask HJ)
  I am considering going from a two-car family to one car as my wife and I seldom use both cars together. Our mileage has dropped substantially from when...
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  Why has my son's Ford Focus showed erroneous fault codes when diagnostically checked? 1 Sep 2010 (Ask HJ)
  The engine warning light on my sons' 2002 Ford Focus 1.6 LX Estate illuminated about four months ago. He had it checked by a main dealer and was told the...
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  Why is my Citroen C3 running slow and losing power? 9 Aug 2010 (Ask HJ)
  My 2002 Citroen C3 1.4 HDI is running slow, suffers a loss of power, and won't go above 3000rpm. It starts easily but it won't tick over straight away....