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Knowing which grade of motor oil to use in your car Consider the climate and environment where you do most of your driving. For example if you live and operate your motor-vehicle mostly in Portland, Oregon in comparison to Miami, Florida you realize there are some extremely different conditions that will have an effect on the engine's operation. So if you operate in an extremely hot climate, you will want to use motor oils that are on the top of the SAE viscosity ratings which are approved for your particular vehicle. And obviously, if you operate in an extreme cold climate you will want t...