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oil drain plug size

This is a discussion on oil drain plug size within the General Help forums, part of the LSx Technical Help Section category; what size is it? i am having issues. think i need some sleep, but i can't get the damn thing ...

  1. #1
    Junior Member
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    MidnightBlue
    2001 TransAm

    oil drain plug size

    what size is it? i am having issues. think i need some sleep, but i can't get the damn thing off. . . . .thanks

  2. #2
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    black
    1999 Pontiac Trans Am

    If you mean the wrench size, 15mm. Tighten to 225 inch lbs.

  3. #3
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    Yep, 15 MM. Oil change places like to overtighten it; filter too.

  4. #4
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    Arctic White
    1999 30th Anniv Trans AM

    Originally thought that this topic would cover drain plug thread size. I believe I have since found the right drain plug on Jegs as Thread Size: M12-1.75. Is that correct?

    Also, it appears they also sell a rubber washer/gasket for the drain plug. Does the stock LS1 drain plug have a replaceable rubber washer/gasket on it?

    Mine is seeping and I'd rather replace a washer instead of the whole drain plug if in fact it's replaceable. Thanks for any help.

  5. #5
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    black
    2014 camaro 2ss/rs

    yes it is 12mm x 1.75. just buy the whole bolt. i think the gasket is integrated.
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  6. #6
    Member sjgreen6's Avatar
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    Navy Blue
    2002 Trans Am WS6 Conv

    Current GM Part number is 11562588. Has the integrated gasket.
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