Ask Honest John

Most recently answered dpf questions
I'm planning to buy a new or nearly new Honda Civic Tourer but don't know which engine to get. I drive 12,000 miles per year and my daily commute is a 32 mile round trip. I know that the diesel is much...
I own a 2016 Nissan Navara, which needs a new DPF after just four months. This is my 4th Navara and never had issues before. There is no mention of the driving standards or shorter journeys in user manual....
I own a 2012 Mazda 3 with a 1.6-litre diesel engine. Recently a warning light came has come on, stating that the oil level is too high. A local mechanic tells me this is something to do with the DPF regeneration....
You frequently advocate the use of Shell V-Power Nitro Diesel which I have used in my Citroen C5 from new. You also state that diesel engines are prone to suffering from clogged up DPFs at 80,000 miles,...
I just bought a SEAT Leon diesel with 52k on the clock. Within 2 weeks the DPF yellow light came on. The car had a couple of hundred motorway miles in that time as well as some city driving. The car...
I'm considering purchasing a used Renault Trafic, although my question is about DPFs in general. So to start regeneration you should be driving motorway speeds to achieve high exhaust temperatures, how...
I am thinking of buying a Mazda CX-5 2.2 diesel automatic (2WD). I have two questions :- (a) Will the above vehicle be adequate to tow a caravan, 1300kgs gross laden weight, bearing in mind it is an automatic? (b)...
I have a 59 plate BMW 1 Series 118d. For the past few weeks the DPF light has been coming on after about 10 mins after driving. My local garage says the DPF is block and needs replacing. I asked if they...
How much will a DPF replacement cost for my 2010 Renault Grand Scenic?
I have a 2012 Vauxhall Corsa, it's done around 25,000 miles and recently it has been juddering as I go up the gears. I took it to the garage and they put it through diagnostic machines and no fault could...
 

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