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Larger oil filter trivia

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Alex, Sep 11, 2001.

  1. Alex

    Alex Registered Member

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    Hi all, I know this is an old subject, but I’m just curious. I'm running an AC 1218 oil filter on my '91 full size Blazer (5.7L). The manual specifies a smaller oil filter. Anyone else using the AC 1218? Of course I prefer the larger filter but I’m not quite sure why GM would recommend a smaller filter. Also, I have the OEM oil cooler if it matters. Any thoughts?
     
  2. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    To be honest (I am no oil filter expert), but I believe running a larger filter will not hurt (double check to make sure). I think some application call for a smaller filter due to space restrictions. I do not run Frams any more, but mine used to call for a PH30 and I used to run a PH13 (which was bigger with no problems). I have read that since they all are designed to work at approximately the same pressure range, that it is not a problem, but again I am no expert.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot>http://coloradok5.com/gallery/Leadfoot</a>
     
  3. Wheels

    Wheels 1/2 ton status

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    Space considerations. Also, when your engine dumps the oil into the larger filter expansion occurs and heat is released (a little physics refresher). Not much though since it is a small space. I put mine on a remote filter and run a larger filter. The headers was cooking the oil where it was located.
     
  4. DMK

    DMK 1/2 ton status

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    I run a 1218 thought it was bigger than a pf35 but they look to be the same size.
     
  5. ftn96

    ftn96 1/2 ton status

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    Alex, I got into it with the parts clerk over this very same issue. The 4wd fiter is smaller than the 2wd filet but the sma engine. He said it was was for space/clearance.
    But I have no trouble or clearance issues with the large one.

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     

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