  We present results of a CO(1-0) line survey in a complete sample of 12 low
redshift (Z < 0.1), optically bright QSOs (PG QSOs with M_B < -23 mag). Six new
CO detections are reported here at levels exceeding I_CO ~2 Jy km/s. Combined
with three previously reported detections, we find that 9 of the 12 QSOs have
abundant, dense ISMs characteristic of late type galaxies. In all 9 of the
detected QSOs, the derived molecular gas masses are M(H2) > 1.0e9 M_solar, with
the most massive being 1e10 M_solar ~(PG 0050+124 -- I Zw 1). In the three
sources not yet detected in CO, the upper limits on the gas masses are ~ 1e9
M_solar and thus we cannot rule out abundant ISMs even in these objects. Since
our sample was chosen entirely on the basis of low redshift and optical
luminosity (and not selected for strong infrared emission), we conclude that
the majority of luminous, low redshift QSOs have gas-rich host galaxies and
therefore can not be normal elliptical galaxies.
