Transient thermal EHL line contact simulations are carried out to study the traction behavior during accelerated motion considering realistic shear-thinning and surface roughness effects. Using three lubricants with different inlet viscosity and shear-thinning parameters, the application of present analysis for lubricant selection is demonstrated. Owing to squeeze film action, the film evolution is delayed and start-up traction is found to increase much above the designed value. This effect increases with decreasing roughness wavelength especially at high amplitudes. The most shear-thinning test oil considered here yields the lowest traction coefficient with minimum variation in its value desirable for smooth and vibration-free operation.