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  The oil in my Mercedes-Benz C200CDI is black after just 1500 miles. Does it need changing? 9 Sep 2010 (Ask HJ)
  You repeatedly recommend to change the engine oil more frequently, ie every six months. On your website under 'Running in a diesel' you say "Leave factory...
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  Excess oil consumption? 1 Dec 2012 (Ask HJ)
  My daughter's car was serviced in September. When she came to visit last week, my husband checked her oil level to discover it was very black and half...
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  Black smoke from a 307 diesel? 29 Apr 2014 (Ask HJ)
  My wife has a 2005 Peugeot 307 1.6 HDI that has a diesel knock and blows black smoke on starting. It gets worse then better, occasionally running well...
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  Should I worry about black oil? 26 May 2012 (Ask HJ)
  I have just picked up my HDI Citroen C3 Picasso from its two year service (25,000 miles) and on checking the oil level the oil is black. On lifting...
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  Main dealer oil changes 14 Apr 2011 (Ask HJ)
  My company car is a VW Touran 1.9 TDi which I have had serviced at the local VW main dealer four times. After each service I make a point of checking the...
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  Carbon fingerprint 22 Aug 2009 (Ask HJ)
  I have purchased a Honda Accord Tourer 2.2i-ctdi. The car was first registered on 18/09/2007 and I purchased it in February 2009, at 18 months old, with...
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  Vauxhall Astravan blowing grey smoke 30 Oct 2016 (Ask HJ)
  I have a 2009 Vauxhall Astravan 1.7 diesel. In the past few weeks the vehicle has started developing a smoking issue, which no one can find an answer for....
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  Dip sick 10 Sep 2011 (Ask HJ)
  I've just had my Toyota Urban Cruiser 1.4 D-4D’s first 10,000-mile service by the Toyota Garage that sold me the car 9 months ago. When I got home (approx...
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  Why is my 2002 Renault Clio smoking? 31 Jul 2010 (Ask HJ)
  I have a 2002 Renault Clio II 1.5 diesel. I would like to know why it produces black smoke? We have replaced the turbo, which was faulty. While driving...
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  Why has the oil in my diesel car turned jet black? 5 May 2017 (Ask HJ)
  I have a Subaru Outback 2.0d Premium which I have owned from new. It has done 11000 miles (mostly high speed long distance and motorway) and I have noticed...
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  Why is my FIAT 500 1.3d making noise and emitting black smoke? 17 Feb 2017 (Ask HJ)
  I have a 2011 FIAT 500 1.3 MultiJet diesel purchased in March 2016. I've had a problem with sporadic engine noise, vibration and black smoke coming out...
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  Oil changes - quality of main dealer servicing 18 Apr 2011 (Ask HJ)
  I own a 2007 A8 3.0 TDI, which I cherish. It is main dealer serviced (variable) and I have never added a drop of additional oil. I have noticed that...
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  Should my Peugeot 207's engine oil be black after an oil change? 11 Aug 2010 (Ask HJ)
  I had a service carried out on my Peugeot 207 sport 1.6D, and as part of that service the oil and filter was changed. After two days I checked the oil...
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  DPF regeneration and low oil 16 Aug 2014 (Ask HJ)
  I recently had my 2010 plate Volvo XC90 serviced by our local Volvo dealer. On returning home (seven mile trip) I checked the engine oil. It was black...
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  Black smoke from a Hyundai Santa Fe 21 Aug 2015 (Ask HJ)
  For a couple of months now, I've had an intermittent problem with black smoke from the exhaust coupled with a reduction in power. Recently it's become...
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  Diesing out the dirt 14 Nov 2009 (Ask HJ)
  My wife has a FIAT 500 diesel (which she loves) and we took it in for a first service at £149. I didn’t check the oil after the service to ensure it had...
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  Focus 1.8 TDCi injector problem 3 Nov 2015 (Ask HJ)
  I just bought a used 57 plate Ford Focus 1.8 TDCi. I had it serviced and the guy said that the injector has a bit of a leak and the seals need to be replaced...
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  Black smoke from Mercedes C200 18 May 2015 (Ask HJ)
  I own a Mercedes-Benz C200 2010 model.It has 400,000KM and lately I noticed the following: When i start the car, it works at around 800rpm. When...
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  Diesel engine continues running after ignition switch-off 16 Jul 2012 (Ask HJ)
  the engine continues to run after ignition switch off and key removal. Engine tone louder and clackety higher revs. Engine will rev using throttle - but...
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  What is causing my Mercedes-Benz E320 diesel to smoke under acceleration? 25 May 2013 (Ask HJ)
  I have a 2002 Mercedes E320 diesel automatic estate. It has done 115,000 miles and I now use mainly Shell V-Power or other brand fuel, but I have been...