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gmc 366 big block question

Discussion in 'Chevy Trucks' started by chev_4x4, Sep 13, 2014.

  1. chev_4x4

    chev_4x4 Senior Member
    Messages: 129

    Have a 1990 gmc topkick with a 366 big block. Want to change the oil but don't know the oil capacity of it. Looked online several times could not find it. Coming here for all the answers I can't find anywhere else.
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,398

    20 quarts if I remember. Or there abouts
  3. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,398

    I'm thinking I'm wrong. I can see the sharpie number, but I'm thinking that's the cat motor trk. Try 10 first
  4. 2006Sierra1500

    2006Sierra1500 PlowSite.com Addict
    Messages: 1,758

    Start with 8 quarts, see where it is on the stick, add as needed.
  5. maxwellp

    maxwellp PlowSite.com Addict
    Messages: 1,123

    It should have an 8 qt pan. But? Try 6 and see if is on the stick and go from there.
  6. chev_4x4

    chev_4x4 Senior Member
    Messages: 129

    Thank you very much
  7. peteo1

    peteo1 PlowSite.com Addict
    Messages: 1,660

    Why not call a GM dealer instead of listening to a bunch of guys on the Internet who aren't all that sure. Just because I'm a good sport I'll play too...start with 7 quarts and go from there
  8. leolkfrm

    leolkfrm PlowSite.com Addict
    Messages: 1,980

    are you using a 1 quart or 2 quart filter? they came with both....should be 7 to 8 quarts