  We study the SU(3) gluon propagator in renormalizable $R_\xi$ gauges
implemented on a symmetric lattice with a total volume of (3.25 fm)$^4$ for
values of the guage fixing parameter up to $\xi=0.5$. As expected, the
longitudinal gluon dressing function stays constant at its tree-level value
$\xi$. Similar to the Landau gauge, the transverse $R_\xi$ gauge gluon
propagator saturates at a non-vanishing value in the deep infrared for all
values of $\xi$ studied. We compare with very recent continuum studies and
perform a simple analysis of the found saturation with a dynamically generated
effective gluon mass.
