08/20   I drive a 90s Japanese automobile, and I live in the
        bay area, where the weather just isn't that bad.  What
        sort of motor oil should I be using?
        \_ weather is irrelevant in the Bay Area where temperature

           and humidity swing are minimal. More importantly, you should
           be CONSISTENT with the motor oil you use (stick to one brand,
           one type, and change on a consistent schedule). 90s car require
           oil change every 3K miles. A decent brand 10W/30 does the job.