Reply To: Today's Motor Oils

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I personally would use a 10W-30.  When I lived in Southern California I always used mulit-viscosity oils eventhough it rarely got below freezing.  Oil will deteriorate just sitting in the engine and may look clean on the dipstick (a good thing) but may have drawn moisture from the atmosphere.  Condensation can be a problem for oils although modern oils have additives to help with that.  Be sure to use a quality filter as well.  I prefer Motorcraft but have used Purolator and Fram as well.