According to The Serial Number Book for U.S. Cars: 1900-1975 by Grace Brigham, the location of Oldsmobile serial number varied over the years and included "under front seat, left side; on cowl under hood; also plate on engine; in 1930's: on flange top of frame." The book also states that the serial number in 1936 should be between 100,001-139,925. Good luck. If you can't find it, fill out our Research Request Form (AACA Library) and we will dig deeper. -Chris AACA Library & Research Center