I agree. That's why almost ever manual (even the current Corolla) says to use a higher viscosity oil for better protection during extreme use (towing, racing, extended high speed driving, etc), but says to switch back to the lighter one (0W16) for *FUEL ECONOMY*.Thicker oil generally provides better protection. The question is whether or not you need it. Most people simply do not. It would be like if you wore football pads to go grocery shopping. I mean yeah sure I guess you are safer...?