Precipitation and gelation of long chain paraffins from oil presents a challenge to the recovery and processing of waxy crude oils and fuel stocks. Diblock polymers consisting of a crystallizable polyethylene (PE) block and an amorphous poly (ethylenepropylene) (PEP) block self-assemble in oil to form expansive plate-like aggregates, consisting of a PE core within a PEP brush layer. In the presence of crystallizable paraffins the crystalline PE core can promote nucleation of solubilized long chain paraffins or may cocrystallize with the paraffin phase with the soluble PEP brush providing steric stabilization of the wax crystals. We examine the effect of PE-b-PEP additives of varying PEP brush length (5 and 11 K) on the yield stresses of straight chain paraffin gels (ranging in length from 24 to 36 carbons) in decane. PE-b-PEP addition at levels as low as 500 ppm produce reductions of wax gel yield stresses by factors of 3000. At higher PE-b-PEP addition levels gels can be formed with higher yield values than solutions without polymer. The location of the minimum in the yield stress with respect to polymer addition depends on the molecular weight of the paraffin and the PEP brush length; Microscopic crystal dimensions and mobility correlate with the observed theological results. Potential underlying mechanisms for the observed efficiencies are discussed.