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Viscosity Curves Don't Lie
Data shows that unless you see start-up temps below 10F there is really no engine wear advantage in using a 0W syn oil over a 5W syn oil. Fuel savings could be small. OW oils have a purpose and would be a great choice in winters where the average start up temp is 10F or less.
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My morning garage temps seem to range around 35F-45F (Jan-Feb) so a 5W-30 works best .
5W-40 oil outside of winter. I could use a thinner oil say 5W-30 but my oil temps are 225-240F . Since oil viscosity is measured at 40C & 100C I know my oil at 230F is less than a 40 weight. Then throw in a little fuel dilution (found in DI cars) and I have a light 30 weight oil once I am at operating temps.
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So every case and location can be different.
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