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Thread: Square vs round o-ring oil filter seals

  1. #1
    Join Date
    Mar 2008
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    Kilmore, VIC
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    832

    Square vs round o-ring oil filter seals

    I just received two oil filters for my 368DT that were purchased under the same part number (LR002338) and as OEM (Mahle). One arrived in a blue box (OX 196/1D) and with a round seal and is as I've received and used exclusively in the past. The other arrived in an orange box (OX 196/1 D1) with a square section seal. The seals measure ō3.5 / 3.5mm square respectively. The square seal is smaller in major diameter so would need to be stretched onto the canister a bit more than the round seal. Refer pictures. The filters appear to be identical in all regards.

    Is the square seal OK to use. Given how snug the round one fits I have concerns the square one may cause the canister to be difficult to screw down and/or bunch up the seal and therefore potentially leak. Am I tilting at windmills here?

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    DiscoClax
    '94 D1 3dr Aegean Blue - 300ci stroker RV8, 4HP24 & Compushift, usual bar-work, various APT gear, 235/85 M/Ts, 3deg arms, Detroit lockers, $$$$, etc.
    '08 RRS TDV8 Rimini Red - Compomotives, 285/60 BFGs, Rock sliders, APT full under-protection, Mitch Hitch, Tradesman alloy rack, LLAMS, VCIQ

  2. #2
    Join Date
    Nov 2015
    Location
    Melbourne
    Posts
    343
    I've used both types of seals over the decades on many different types of vehicles without any issue. If it came in the box, then it should be fine. Always lubricate the seal with a bit of clean oil or silicone grease.
    2013 D4 expedition equipped
    1966 Army engineering trailer
    (previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE HS2.8)

  3. #3
    Join Date
    Mar 2008
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    Kilmore, VIC
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    832
    Quote Originally Posted by DieselLSE View Post
    I've used both types of seals over the decades on many different types of vehicles without any issue. If it came in the box, then it should be fine. Always lubricate the seal with a bit of clean oil or silicone grease.
    Thanks for that feedback. I just hadn't seen the square type and wasn't sure given the differences. I always lube the seals before assembly with whatever the working fluid is. I think I learned that lesson when I was 18....
    DiscoClax
    '94 D1 3dr Aegean Blue - 300ci stroker RV8, 4HP24 & Compushift, usual bar-work, various APT gear, 235/85 M/Ts, 3deg arms, Detroit lockers, $$$$, etc.
    '08 RRS TDV8 Rimini Red - Compomotives, 285/60 BFGs, Rock sliders, APT full under-protection, Mitch Hitch, Tradesman alloy rack, LLAMS, VCIQ

  4. #4
    Join Date
    Jan 1970
    Location
    Canberra
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    15,690
    What is a 368DT?

    The seal on the oil filter cover should be a square seal and sits so that a corner of the seal protrudes out Not the flat side) . If you have a look at the cannister you will see that the slot that the seal fits in is a v shape so that the square seal has a corner of the seal sticking out and the opposite side sitting in the V section.

    My car has never seen a O sectioned ring for this role and I have never received on with oil filters I have purchased.

    Garry
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  5. #5
    Join Date
    May 2014
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    Point Cook, VIC
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    618

    Square vs round o-ring oil filter seals

    Quote Originally Posted by 101RRS View Post
    What is a 368DT?
    Thatís the 3.6 TDV8.

  6. #6
    Join Date
    Jan 1970
    Location
    Canberra
    Posts
    15,690
    Oh Ok - so why is this in the D3/D4 section as the TDV8 was not fitted - this means my comments are probably not relevant as I assumed we were talking about a 2.7 in a D3/D4/RRS not a TDV8 in an L322 or RRS

    Is the oil fiter system in the TDV8 3.6 the same as a 2.7 TDV6
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  7. #7
    Join Date
    Mar 2008
    Location
    Kilmore, VIC
    Posts
    832
    Apologies for any confusion. I generally tend to get a better response here than in the L320 section and originally thought the filter was common to the Lion V6 (it's not). I believe my oil filter is only used in the 3.6 Lion V8 in L320 and L322, plus some other engines from other manufactures (non-LR). Mods feel free to move if/as appropriate.
    DiscoClax
    '94 D1 3dr Aegean Blue - 300ci stroker RV8, 4HP24 & Compushift, usual bar-work, various APT gear, 235/85 M/Ts, 3deg arms, Detroit lockers, $$$$, etc.
    '08 RRS TDV8 Rimini Red - Compomotives, 285/60 BFGs, Rock sliders, APT full under-protection, Mitch Hitch, Tradesman alloy rack, LLAMS, VCIQ

  8. #8
    Join Date
    Mar 2008
    Location
    Kilmore, VIC
    Posts
    832
    Follow-up. My Indie reckons the square seal is not suitable and has given me a round one to replace it. He was quite firm that it didn't suit my application and had only ever used, fitted and seen round seals on the 368DT engine.
    DiscoClax
    '94 D1 3dr Aegean Blue - 300ci stroker RV8, 4HP24 & Compushift, usual bar-work, various APT gear, 235/85 M/Ts, 3deg arms, Detroit lockers, $$$$, etc.
    '08 RRS TDV8 Rimini Red - Compomotives, 285/60 BFGs, Rock sliders, APT full under-protection, Mitch Hitch, Tradesman alloy rack, LLAMS, VCIQ

  9. #9
    Join Date
    Jan 1970
    Location
    Adelaide - Torrens Park
    Posts
    7,234
    If you buy a Ryco filter it comes with both seals. From memory the square section are for some Audi applications only.
    (76 Two Door - Unmolested)
    (88 Hiline - Now with Limited Slip rear diff)
    (07 Vogue TDV8 )

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