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Synthetic Oil Test in Dynojet Dyno Dynamometer , more horsepower, more torque, less noise Best Synthetic Motor Oil Shell Helix Ultra 10W60 5W40 10W60 5W40A 10w40 motor oil is a thicker oil at startup than a 5w30 motor oil Therefore, 10w40 oil clings to the engine's moving parts more than the lower viscosity 5w30 oilThe 5w40 at 75*f The thickness at 212*f is the same It's not the same when cold Next, flow vs psi and the cushion oil provides, ho wait I covered that with the info from bob's the oil guy Then their is the oil recommendation from CUMMINS 5w40 Or Other 40 Weight Oils Anybody Use Them Second Generation Nissan Xterra Forums 5w40 vs 10w40 oil