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The 10w40 tends to be thicker than the 10w40 when cold But at a higher temperature, they are both operating at the same viscosity If the vehicle requires a 10w40, then there is no need to use a 5w40 The 5w40 is a very thin oil which will get a vehicle's parts moving easier and be easily lubricated when starting it upAt high temperatures, the 5W40 is thinner and therefore 10W40 would be more effective in operating at high temperatures However, at extreme temperatures, the number may not depict the actual viscosities Generally, the 10W40 motor oil offers excellent protection to the engine at higher temperatures than 5W40 motor oilSo an engine using 10wXX will suffer more cold start engine wear than an engine using 5wXX or 0wXX oil 10w40 is thicker than 5w40, ONLY when cold At operating temperature it is exactly the same Multiviscosity oils with a lower W number are specifically designed to flow better, and thus lubricate better, at very low temperatures 5w40 Vs 10w40 Which Is Better