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My 2 cents..
Use the thickest viscosity oil you can get away with (within reason) .. This would generally be the 20w50 Multigrade oils. Viscosity helps oil cling to things. Thin oils run faster. This is good in some motors (like air/oiled cooled motors) where you want the oil circulating as fast as possible. I could see an advantage to lighter oils in cars like ours, (faster draining back to the sump) however 20w50 once its at operating temperature flows very well. And it is recommended in most climates.
In any case, use the recommended viscosity for your climate and change frequently and you can rest easy.
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