Discovery 2017

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  • T4fty
    Member Since: 14 May 2025
    Location: Liverpool
    Posts: 9
    United Kingdom 

    Blow by td6

    Can anybody advise me what is the blowby like on your td6,s first time owner 2017 discovery 5 first edition which has i think excessive blow by from the oil cap when the engine is running
    14th May 2025 3:47 pm
  • Mole HD
    Member Since: 18 Nov 2024
    Location: Orkney Islands
    Posts: 72
    Scotland 
    2017 Discovery Td6 HSE Fuji White

    Without looking at it, if it's excessive, it could point to a clogged PCV valve (Positive CrankCase Ventilation valve). Without being hands on, it's almost impossible to tell.

    That's just a guess since my TD6 has very little blow-by...


    Last edited by Mole HD on 15th May 2025 5:52 pm. Edited 1 time in total
    Atque in perpetuum, frater. Ave atque vale
    15th May 2025 3:15 pm
  • T4fty
    Member Since: 14 May 2025
    Location: Liverpool
    Posts: 9
    United Kingdom 

    Rha is for the reply , I have included a youtube short to view https://youtube.com/shorts/hUZ7qph1UMk?si=cVnUz5gtrTHD-Qp4
    15th May 2025 3:19 pm
  • Mole HD
    Member Since: 18 Nov 2024
    Location: Orkney Islands
    Posts: 72
    Scotland 
    2017 Discovery Td6 HSE Fuji White

    Yup, that's what I'd say was excessive, I can even hear the blowback as well as see it Shocked
    Atque in perpetuum, frater. Ave atque vale
    15th May 2025 3:31 pm
  • DieselRanger
    Member Since: 12 Oct 2017
    Location: God's Country, Colorado
    Posts: 775
    United States 
    2017 Discovery Td6 HSE Silicon Silver

    Mine is a 2017, around 88,000 miles on the clock - absolutely zero oil loss, zero smoke out of the tailpipe.

    Ensure you're using the correct oil that meets JLR spec. I have tried other motor oil (Mobil 1 full syn, correct weight, everything but the JLR spec) and I indeed experienced reduced fuel economy by about 1-2 mpg.

    If you don't have a history of the vehicle, get an oil test. The oil test I had done at the end of the Mobil 1's life showed increased iron against previous results from the same tester...a sure sign something didn't like that oil. I went back to the JLR spec oil and everything has been fine since.

    Most of my mileage has been either motorways or off-road under stress. Just how diesels like it. Stop-and- go town driving kills these engines rather quickly.
    18th May 2025 3:05 pm
  • Mole HD
    Member Since: 18 Nov 2024
    Location: Orkney Islands
    Posts: 72
    Scotland 
    2017 Discovery Td6 HSE Fuji White

    Besides any branded/non branded oil related issue...there's definitely a mechanical problem there. Way too much blow-by from that oil filler in the video.

    I'd still say it's more than likely to be related to the PCV, clogged or inop...he also has a loose, broken component he found rattling around the left hand side of the engine bay (from his other recent post on this forum). It has what looks like a broken or severed rubber breather pipe attached. I still haven't been able to identify what part it is or where it's originally come from.

    I initially thought 'broken air suspension part', due to it's appearance and where he discovered it...now I'm not so sure due to the excessive blow-by issue. It could be engine, fuel or PCV related, I've really no idea yet...



    Speaking as a fitter, doing car mechanics via the internet can't be anything but uninformed guesswork with such limited information, especially when I can't get hands on with it... there's no mention of engine warning lights or dianostic related engine ECU fault codes...I don't know when or where he bought the car, how long he's had it, any service related history...I don't even know what colour it is Shocked


    Last edited by Mole HD on 29th May 2025 8:43 pm. Edited 1 time in total
    Atque in perpetuum, frater. Ave atque vale
    18th May 2025 4:25 pm
  • T4fty
    Member Since: 14 May 2025
    Location: Liverpool
    Posts: 9
    United Kingdom 

    Hi thanks for the reply
    The car was bought from a dealership 3 weeks ago , it has full service history has no fault codes does not blow anything out of the exhaust is not loosing fluid , it is a first edition 3.0 td6 2017 with 90000 miles in black with 22 inch wheels , 7 seats , glass roof , heated and cooled seats I am 46 years old , with blue eyes I live in Liverpool England and I am a Capricorn.
    I hope this is enough information for.you to give a definitive diagnosis if you need anymore info let me know.
    Once again thanks for.the reply.
    25th May 2025 3:27 pm
  • Mole HD
    Member Since: 18 Nov 2024
    Location: Orkney Islands
    Posts: 72
    Scotland 
    2017 Discovery Td6 HSE Fuji White

    Welp, that made me snort coffee out of my nose and all over my keyboard. Thanks for that T4fty Rolling with laughter

    Did you ever suss out what the spare loose bit was or where it came from?
    Atque in perpetuum, frater. Ave atque vale
    25th May 2025 3:36 pm
  • T4fty
    Member Since: 14 May 2025
    Location: Liverpool
    Posts: 9
    United Kingdom 

    Blow by td6

    So the dealer i bought the car off has looked at the footage and sent it to his expert who thinks the last service guy has not used genuine parts or oil which is causing these symptoms , basically I need to take it in have an engine flush and oil change using spec oil and filters and this will cure the symptoms 🤔
    29th May 2025 11:53 am
  • Mole HD
    Member Since: 18 Nov 2024
    Location: Orkney Islands
    Posts: 72
    Scotland 
    2017 Discovery Td6 HSE Fuji White

    That sounds like a decent resolution. I hope the dealer isn't leaving you carrying the can for it though...You could also show the dealer the photo of that loose fuel filter vent housing and see if there's a spring clip missing Thumbs Up


    Last edited by Mole HD on 29th May 2025 7:49 pm. Edited 1 time in total
    Atque in perpetuum, frater. Ave atque vale
    29th May 2025 11:56 am
  • T4fty
    Member Since: 14 May 2025
    Location: Liverpool
    Posts: 9
    United Kingdom 

    Honestly if the car wasn't so good looking I'd of shipped it back by now
    29th May 2025 12:04 pm
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