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    10w30 in the summer, 10w40 in the winter? Is that ok?

    I have been changing my own oil since 1988 (18 y/o w/a 1979 Chevy Van). Then I went to a '90 Cavalier Z24, then a '94 Gran Prix, then a '90 240SX, '01 Olds Alero and now a '00 Max. All this time I have been of the mindset: 10W30 in the winter, 10W40 in the summer. Living in TN, I always liked...
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