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Thread: Is DPF a viable proposition for me.

  1. #1
    Senior Member rchiv's Avatar
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    Is DPF a viable proposition for me.

    I drive between 9 to 10K per year and use the car daily.
    Approx 200 miles a week made up of mainly short journeys of between 3 and 28 miles. Every couple of weeks I will do a round trip of about 150 miles.
    Due to the new ULEZ in London from 2021 I will have to change my car and I would like to keep to diesel but to comply the vehicle would have a DPF and AdBlue.
    Would the DPF regenerate successfully doing this type of mileage or would I be constantly getting "Regen required" messages.
    What happens if I am on my way to a set appointment and the message comes up but I do not have the time to do the 20 mins at 30mph routine. When switching off the ignition and after my appointment I restart will I be able to complete the regeneration or will it just upset everything and finish by getting the Red message.
    I am reluctant to trebling my VED and halving my MPG by going petrol.
    Any advice will helpful.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zircon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 122K Mods:- Electric Autofold Mirrors on Locking
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  2. #2
    Senior Member Jim_S-V6_2004's Avatar
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    Maybe I should wait to answer after other members Roger, but you already know I'm a big opponent to the DPF.

    If the regen doesn't complete, it will restart. From the beginning.

    And I think it's 50mph or 3,000 rpm for 30 minutes?

    Different experts give different advice on t'net.

    Some try to make it sound simple, nothing to worry about. But I think I remember over 6,000 diesel vehicles a year are blown, I read somewhere and can't find again.

    As for mpg, look closely and you'll find you only get 20 to 30mpg at less than 60mph and only after the car is warm, up to 10 minutes in winter.

    Almost any recent (2010+) petrol car will give you that and more, and over 40 mpg on motorways at 60 to 70 mph.

    Check it out, you may get a (nice) shock.

    .

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    Senior Member Zero123's Avatar
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    Unfortunately you can't control when a regeneration takes place - it seems to have a mind of its own (now where have I heard that before?). So, yes, you could quite possibly get to an appointment when it decides to start the process. However, you must not then switch off the engine! If you do all the extra fuel that is needed to get the dpf up to temperature will get dumped into the sump - thus diluting the oil. Do this too many times and your oil level will rise with disastrous consequences. The process, if interrupted, will start all over again with more extra fuel the next time the engine decides it can reach the required temperature.

    That's about the only thing I don't like about my 2010 VW Passat. I don't see why they can't just give a warning that a regeneration is needed within the next 20 miles or so and then you can decide whether to do it straight away or or leave it till next time.
    "I know I'm a pessimist because my glass is always half empty...even when it's full".

    2009 X-Type 2.2D Sovereign - Indigo Blue with Ivory Leather

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    Senior Member rchiv's Avatar
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    Quote Originally Posted by Zero123 View Post
    Unfortunately you can't control when a regeneration takes place - it seems to have a mind of its own (now where have I heard that before?). So, yes, you could quite possibly get to an appointment when it decides to start the process. However, you must not then switch off the engine! If you do all the extra fuel that is needed to get the dpf up to temperature will get dumped into the sump - thus diluting the oil. Do this too many times and your oil level will rise with disastrous consequences. The process, if interrupted, will start all over again with more extra fuel the next time the engine decides it can reach the required temperature.

    That's about the only thing I don't like about my 2010 VW Passat. I don't see why they can't just give a warning that a regeneration is needed within the next 20 miles or so and then you can decide whether to do it straight away or or leave it till next time.
    That's what I am worried about

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zircon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 122K Mods:- Electric Autofold Mirrors on Locking
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
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    Senior Member JimC64's Avatar
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    There's no warning as far as I'm aware on my XJ, The regen takes place when it takes place and that's that.

    I've been running my 2016 XJ X351 3.0D for around 16 months and approx. 20k miles with no issues. A lot of those miles are 2-3 miles to the shops and back, here n there, stop / start

    I also ran my 2.7Tdvi XJ X358 for around 4 years and 70k miles with little issues re the DPF etc ( other than self inflicted by trying to delete it )

    Someone that looks after their car and does regular checks will be fine, check the oil levels and worst case scenario you may have to do more frequent oil changes, I did 3-4 per year on the X358 and may be 2-3 on this car.
    These can be done yourself with a vacuum pump with little hassle and for low cost

    If you want it to be, it is an option, your choice Roger

    Cheers
    Jim
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  9. #6
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    NO it would be a complete disaster. Yours is about the worst scenario for a DPF diesel.

    Next to those fitted to Nissans, the Jaguar DPFs are amongst the most troublesome and if neglected frequently cause engine damage (source my local Jag specialist).

    I would stay WELL CLEAR of any diesel car with a DPF for city use (some on pickups seem less problem).

    If you are determined to go the diesel route (maybe running on red?) then do as we did with the Nissan....remove the DPF and replace it with a plain pipe until MOT time - refit it for the MOT then remove it again. You may want to have the DPF deleted from the engine management.

    It is a bit of a bother but that works for us and will do until the vehicle is swapped for a petrol.

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    Senior Member rchiv's Avatar
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    Quote Originally Posted by Percentage View Post
    NO it would be a complete disaster. Yours is about the worst scenario for a DPF diesel.

    Next to those fitted to Nissans, the Jaguar DPFs are amongst the most troublesome and if neglected frequently cause engine damage (source my local Jag specialist).

    I would stay WELL CLEAR of any diesel car with a DPF for city use (some on pickups seem less problem).

    If you are determined to go the diesel route (maybe running on red?) then do as we did with the Nissan....remove the DPF and replace it with a plain pipe until MOT time - refit it for the MOT then remove it again. You may want to have the DPF deleted from the engine management.

    It is a bit of a bother but that works for us and will do until the vehicle is swapped for a petrol.
    Thanks for your thoughts, however removing and deleting the DPF on a late model is out of the question. Your MOT would be invalidated as would your insurance. Falsifying your insurance is not the sensible way IMHO.If you were in an accident the assessors would check such things, say no more.
    I do not live in a city environment but use roads which encroach on the extended ULEZ from 2021.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zircon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 122K Mods:- Electric Autofold Mirrors on Locking
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

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    Senior Member J.J.X.T's Avatar
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    I recently looked at the XE although I'm not taken with the interior. The dealer tried to get me to look at diesels - there are plenty about! The mpg and VED are tempting but the sort of driving I do now - more short journey made me decide its just not viable there seem to a number of potential issues particularly the dpf so I shall stay with petrol engines!
    Jaguar XF Luxury 3.0 V6 petrol, in Claret Red with barley leather, Venus alloys


    previously Jaguar X Type 2.1 V6. Gone but not forgotton

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    Senior Member Jim_S-V6_2004's Avatar
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    So what's your gut feel now you've had some suggestions Roger?

    .

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  16. #10
    Senior Member rchiv's Avatar
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    Quote Originally Posted by Jim_S-V6_2004 View Post
    So what's your gut feel now you've had some suggestions Roger?

    .
    Positive at the moment Jim. Apart from getting a "Dislike" by one who doesn't like being answered constructively from the results it would seem to be a possible diesel as long as I look after the regeneration and fuel dumping into the sump.
    I would have thought I would have had a few more replies as there are thousands out there.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zircon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 122K Mods:- Electric Autofold Mirrors on Locking
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

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