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Thread: dpf and oil,a must read

  1. #1
    Regular Member solorider's Avatar
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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9 120bhp

    Year : 2004

    Mileage : 139,600

    Default dpf and oil,a must read

    all of you who have a dpf fitted to their car MUST use 5w30 long life oil,using semisynthetic will shorten the life of the dpf,using any normal fully synthetic oil will do the same due to the sulphur content of the oil

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    And phosphuros

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    Regular Member Jamie's Avatar
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    Whats a DPF?

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    Regular Member Caterman's Avatar
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    Vehicle : Signum

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    Diesel Particulate Filter m8.

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    Regular Member Gsi3.2's Avatar
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    read and understood..but our's goes back AGAIN on monday for it's particle filter..

    had the recall... then had a new DPF.... now they think they may change it again....

    CDTi.... no thanks....


    :EDIT:...BTW.. it has only ever had 5W30 VX fully synth longlife...the price we pay for it it's stupid not to..
    Last edited by Gsi3.2; 15th March 2007 at 20:11.

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    Regular Member ballogie's Avatar
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    Where did this info come from and how does oil spec affect the dpf. Surely there should be no oil anywhere near the dpf. My local dealers put 10w40 into my Signum last week and it has taken the intervention of VX customer services to make them offer to change it.

    What are the facts on this, has 10w40 damaged my dpf ( it now smells) and how has it damaged it ?

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    Regular Member Gsi3.2's Avatar
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    SOLORIDER works in a VX dealers parts dept..he'll be on again to explain further about this no doubt..

  8. #8
    Regular Member ballogie's Avatar
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    The reason I ask is that VX might have sent out a reminder to dealers not to skimp with the oil as a direct result of my berating them about the Aberdeen dealer putting 10w40 into my car. If this is so, it strengthens my case re the incompetence of the dealer and I'll take it further holding them completely responsible for any further problems I suffer re dpf and any engine problems I encounter for as long as i own the car

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    Regular Member solorider's Avatar
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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9 120bhp

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    Quote Originally Posted by ballogie View Post
    Where did this info come from and how does oil spec affect the dpf. Surely there should be no oil anywhere near the dpf. My local dealers put 10w40 into my Signum last week and it has taken the intervention of VX customer services to make them offer to change it.

    What are the facts on this, has 10w40 damaged my dpf ( it now smells) and how has it damaged it ?
    all engines will burn some oil,with 10w40 semi synthetic oil when it is burnt it will give off sulphur which can affect the operation of the dpf,we have recieved leaflets from vauxhall which explains the operation of the dpf and the effects of having the wrong oil.
    having the wrong oil for a week wont affect the dpf but i would take the car back and get them to use the correct oil,remind them that all cars on the ecoflex servicing should use 5w30 long life oil

  10. #10
    Regular Member Ste's Avatar
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    Working for a commercial diesel engine manfacturer, in emissions control, I prob know more than most about the operation of DPFs. They have been around for quite a few years in commercial applications.

    The filter works by oxidising soot (carbon) at lower temps than 'normal' burning in oxygen. Oxidation in O2 would be at above 500 Deg C, if NO2 (nitrogen dioxide) is used instead it can be done as low as 250 Deg C.

    NO2 is not produced in sufficient quantites by a diesel engine to regen enough soot, but it does make lots of NO. If a highly active oxidation catalyst material is used, either separate upstream to the DPF or coated onto the DPF itself, then it can convert the NO into NO2. Hence regeneration etc etc.

    NOW, if the oil has too high a sulphur content, or phosphorous, or silicon !!!, or lots of other catalyst pollutants, then the oxidation of NO to NO2 cannot happen as the catalyst has been poisoned. This means that the regen cannot happen at lower temps, and you get a nice reaction going on inside the DPF at very high temps which damages it.

    That is the reason why the oil should have low S levels. It seems that the long life oil has low enough S content, and the std oil has too high content. That what is being said anyway. Whether all fully synth has too high S level is not known. Do VX publish the max S level of oil that can be used ??

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