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Thread: 2.7 Oil Dilution

  1. #1
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    2.7 Oil Dilution

    Hi all,

    I recently noticed that the oil had increased over the max on my 2.7. I thought I would send a sample off to milers oils and see how bad the dilution is. I have attached the report in which the findings are that the oil is over 7% diluted. I will be changing the oil ASAP.

    I change my oil every 6 months on average with the last chance being approx. 5-7Kmiles ago/early May. I used Shell 5w30 rated C1 as per jaguar landrover latest specs.

    I now have seen for myself how potentially disastrous these engines are in any Jaguar or Landrover, 2.7 or 3.0.

    What is most annoying is that despite some town runs the car gets very good runs over the weekend so there is no excuse for driving style or not giving it a change to regen. I think it is a design flaw in the software as I have on occasion completed lengthy runs to find the car is doing a regen about 5 mins from the destination which is madness. I do feel my car runs cool despite a thermostat change however if these engines want a regen they pump in extra fuel which gets the temp up quickly anyway as part of the regen process. Now over the past 6 months the car has completed several successful regens on its own with no dpf full lights or restricted performance. I must have stopped approx. 4 regens by getting out of the car. So could that have caused this excessive dilution?

    So if you have a DPF car change the oil at least once a week so you can get to sleep on a night whilst you are searching for a good 3.0 or 4.2

    Click image for larger version. 

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  2. #2
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    I'm afraid the DPF is a constant nightmare in the S Type if not in other Jaguars.

    Out of curiosity, did you notice if the temperature needle rose at all during the regens?

    And is there any indication of the regen in progress?

    .

  3. #3
    Senior Member Victor's Avatar
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    Do not change the oil ASAP..................change it today, it's vital and urgent.

    b loody p oxy DPF's
    A very cynical grumpy old man
    Late 2004 2.7D auto
    Connoisseur of Fine Ales
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming - What a ride, where are the wimmin?"

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    Member Mack1955's Avatar
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    Ive had my 2.7 since February when first bought after a day or so DPF full warning came on, gave it a good run cleared not a problem since, I keep hearing on the forum DPF taboo, well in my case the cat is a lovely drive and power when needed, so I can only presume its down to poor maintenance, and so happy with MPG average 42 mpg, its like anything else look after and it will look after you.

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  7. #5
    Senior Member Faltwen's Avatar
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    Stopping a regen will cause the diesel in the oil. I had the same issues with my X Type with DPF, had it professionally cleaned but within 6 months was regenerating at the most inopportune moments. i.e. when parking up after a 200 mile journey!
    I had to change the oil at least twice a year due to diesel contamination. I did have a short journey to work and back (11 miles each way) but used to travel long distances on my days off.
    Now - 2016 Jaguar XE Prestige 2.0 petrol in Bluefire - Parking Assist Pack, heated screen.
    Had - 2008 - 2.2 Auto Sovereign Saloon - Genuine Sovereign Glacier Blue with heated screen, piped seats, Satnav, Premium Sound System, Jaguar Voice, Front and Rear Sensors, Walnut Steering Wheel and dash, Proteus 18" Wheels plus the dreaded DPF!!!!
    2003 2.5L SE - Ultraviolet.

  8. #6
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    Quote Originally Posted by Mack1955 View Post
    Ive had my 2.7 since February when first bought after a day or so DPF full warning came on, gave it a good run cleared not a problem since, I keep hearing on the forum DPF taboo, well in my case the cat is a lovely drive and power when needed, so I can only presume its down to poor maintenance, and so happy with MPG average 42 mpg, its like anything else look after and it will look after you.
    .
    In this case you need to know how to "look after it".

    You can lose your engine in one day, from purr to knock knock knock bang bang bang bang, it's happened to 3 of our members, the last one is recent.

    Heed all the warnings, keep a daily or at least a weekly eye on the oil level. If it rises change the engine oil and filter immediately, or don't use the car until you do. The gap between min and max is about 2 litres. The sump carries 6.5 litres. 1 litre of fuel will dilute the oil to destructive thinness.

    It's from bad experience that we know, not hype. Audi forums deny it happens on their diesels, putting their wrecks down to "poor quality conrods and bearings". But it happened to my daughter's A3 1.9TDi on the motorway. One of their members is a mechie who had 2 to 3 blown engines every week at that time.

    JimC64 and Victor know of Jag specialists who have blown S Type diesels in too.

    So we know better. Don't find out the hard way bud.

    Remember, it's a Destruction Preset Fuse. That's my nickname for them. Look on the net for the number of unknowing owners who lost their engines.

    .

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  10. #7
    Senior Member JimC64's Avatar
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    Quote Originally Posted by Mack1955 View Post
    I’ve had my 2.7 since February when first bought after a day or so DPF full warning came on, gave it a good run cleared not a problem since, I keep hearing on the forum DPF taboo, well in my case the cat is a lovely drive and power when needed, so I can only presume its down to poor maintenance, and so happy with MPG average 42 mpg, it’s like anything else look after and it will look after you.
    Pretty much bang on and my experience too

    I had my XJ X358 2.7Tdvi for 4 years and around 70k miles, never an issue, not once with the DPF

    Most of my journeys were actually 2 or 3 miles, here n there, stop / start with some longer trips thrown in, but...…

    I changed my oil around 3 -4 times per year, preventative maintenance and not that costly either, just made sense to me as i knew about the issues.

    Yes oil dilution took place as my levels rose, but hell did not freeze over.

    I spoke to the current owner, literally just 2 days ago and he's still singing her praises and sitting at a little over 170k miles now, again with no issues, but he services her to death and beyond as I did. He's planning on taking her to at least 200k and see where he goes from there

    Jim
    My_XJ_X351_ownership_thread

    My_XJ_X358_ownership_thread

    Wife's_X_type


    MY2016 ( 65 ) XJ X351 3.0d Portfolio LWB, Black, London Tan leather interior, 20" Orona alloys, picnic tables and rear multimedia
    MY2009 ( 58 ) X type 2.2d Sport Premium, Heated seats, Front & Rear park assist, Sat Nav, 18" Proteus alloys, tinted rear windows, Heko wind deflectors

  11. #8
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    Have you seen these threads in our S Type Stickies subforum:

    https://www.jaguarforum.com/showthread.php?t=111335

    and:

    https://www.jaguarforum.com/showthread.php?t=67640

    Extra fuel is injected into the cylinders to regenerate (clean) the DPF, but I burnt fuel is pushed down into the sump past the piston rings because of the high compression ratio of diesel engines, usually 18:1 or 22:1.

    When a Regeneration cycle is not completed before the car is stopped, it will restart from scratch when the conditions for regeneration are met (40mph and normal engine temp), until it is allowed to complete.

    The ECU will trigger a regeneration cycle around every 300 miles.

    Interesting: the AA article has been modified since I originally found and linked it! I guess some pressure has probably been put on them to tone it down, as this dilution is clearly a common problem caused by the engine management system and DPF.

    .

  12. #9
    Member Mack1955's Avatar
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    Hi Jim, one thing that puzzles me how do you know a regen is taking place, and yes I change the oil every 5k or there abouts as a precaution as I here so much about problems with oil pollution interesting topic DPFs

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    On Mercs and other cars there is an instrument panel indication or message that it's running.

    I've asked a couple of times here in the past, but no S Type diesel owner responded.

    Maybe someone will let us know now please chaps?

    It's possible that oil dilution doesn't happen on other diesel Jags, I don't know as I haven't looked.

    The S Type sends a "Service needed" (or "Service required"?) message if it detects more than a "certain amount" of diesel fuel in the engine oil. I don't know how it does that.

    There is a description in the Workshop Manual.

    You can get a copy of it and lots of other guides here:
    http://www.jagrepair.com

    Click on "Jaguar S Type" in the middle column then click on the "FSM Workshop Manual" link near the bottom of that page.

    .

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