The present study focuses on molecular characteristics and temperature dependence of a superfluid-like stick-slip transition in a series of highly entangled high-density polyethylene (PE) resins and their rheological behavior in pressure-driven capillary flow. It is found that at sufficiently high stresses the capillary flow characteristics are largely dictated by the stick-slip transition occurring at the PE/die wall interfaces. The transition magnitude is found to have an explicit and strong molecular weight M(w) dependence reminiscent of bulk chain entanglement, i.e., the extrapolation length b(c) proportional to M(w)(3.4). In addition to its normal temperature dependence for T greater than or equal to 200 degrees C as described in paper 1, the critical stress for the stick-slip transition ceases to scale linearly with T from 200 down to 160 degrees C for all four molecular weights studied. The extrapolation length b, at the transition also becomes much larger at a lower T. The anomaly is clearly interfacial in nature and may involve a flow-induced ordered mesophase near the PE/wall interfaces.