In this communication we focus on the zero-shear viscosity of a surfactant solution as a key rheological performance indicator, and a key formulation target which is relatively easily measured. We study the self-assembly behavior of SLSar, and co-surfactant cocoamidopropyl betaine (CAPB) to determine if DPD simulations can indeed provide insight into the zero-shear viscosity. We carefully study self-assembly and aggregation behavior observed. We base our work on previously published DPD models used to describe other surfactant molecules. Simulation results are compared to experimentally measured values at similar compositions to understand if there is a correlation between these methods that may form the basis for confidence in a screening protocol for novel surfactants. To be of practical utility, such simulations should be geared as a rapid and cost efficient in silico screening tool, therefore we choose to focus on short time scale simulations, exploring the early stages of self-assembly, the motivation for which is discussed further into the paper.