Using a H-6 oil filter
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This is a discussion on Using a H-6 oil filter within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I was looking around the Subaru Endwrench site ( http://www.endwrench.com/ ) and happend to find this http://www.endwrench.com/current/win...03/insider.pdf Oil Filters: H-4 ...

  1. #1
    Registered User bdoug's Avatar
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    Using a H-6 oil filter

    I was looking around the Subaru Endwrench site (http://www.endwrench.com/) and happend to find this http://www.endwrench.com/current/win...03/insider.pdf
    Oil Filters: H-4 Versus H-6 Engines
    Subaru H-4 engines come from the
    factory with an OEM P/N 15208AA060
    oil filter. The same part number is used
    for replacement. H-6 engines come
    with an OEM P/N 15208AA031, and
    S0A5165109 is used as a replacement.
    Both filters have the same physical
    dimensions as far as threads, O-ring,
    and bypass valve opening pressure (23
    p.s.i.) are concerned. However, the H-4
    filter has 141 square inches of filtration
    surface, while the H-6 filter has 201
    square inches of filtration surface.
    The H-4 filter should not be used on
    the H-6 engine. Using the H-4 filter
    may cause it to become contaminated
    faster and allow the bypass valve to
    open, allowing unfiltered oil to circulate
    through the engine.
    It would seem that the only difference between the two filters is that the H-6 has about 40% more surface area.

    I'm going to change my oil today (gotta get ready for Carlisle ) and I'm planning on using a Pure One filter for the H-6 (P/N PL14459). I'll let you guy know of the differences, if any, and how it works out.
    Last edited by bdoug; 05-01-2003 at 07:25 AM.
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    Registered User PlatinumWRX's Avatar
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    The filter is probably a bit taller. I wonder if that's even a problem. Nice find!

    -Jim

  4. #3
    Registered User bdoug's Avatar
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    OK, just got back from the parts store.

    Externally, the two filters look the same. The H-6 filter isn't any larger than the H-4 filter.

    However, internally the H-6 filter is different. It has a red silicone anti-drainback valve and the bypass valve looks different too.

    The H-4 filter doesn't appear to have any anti-drainback valve, but according to the info on the outside of the box and the Purolator web site, it should have one. Although, I don't remember if the factory installed light blue colored Tennex filter had a anti-drainback valve. I am almost positive that the OEM replacement Purolator filter does not have a anti-drainback valve.

    I was unable to tell if the filter element is different between the two filters.

    In the end, I decided to err on the side of safety (this time ) and I bought the H-4 filter.

    Stay tuned to this thread for more info. In the next couple of weeks I plan on cutting both filters apart to find out what the exact differences are.


    For reference, here are the Pure One part numbers:
    All H-4 engines - PL14460
    3.0L H-6 engine - PL14459

    -Brett
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  5. #4
    Moderator GV27's Avatar
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    PL14459 is also the PureOne for a 2000 Civic EX.

    Does anyone know where the H6 filter is located? With ours hanging upside down it really doesn't need a valve I wouldn't think. It always seems to be full of oil.

    Honestly I often wonder why they produce so many filters - many seem to be interchangeable.

    Was there a price difference? I might just start buying one filter for my car and the wife's. I did that when I used to use Fram.

    Chris
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    Moderating U! KurleeDaddeeWRX's Avatar
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    More part #'s to different oil filters for the WRX can be seen here:

    WRX Oil Filter Part #'s

  7. #6
    Registered User bdoug's Avatar
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    Chris, they were both the same price. In fact almost all the PureOne filters were $5.99.
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