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I live in Central Illinois where you see alittle bit of everything weather wise. Highs in the 90's during the summer(and very humid) to very mild spring and fall seasons in the 50' and 60's. I drive my car mostly between March and November, so it sees varied temps. Do you think the facory 0w 40 is ideal for these driving conditions? I don't wan't to waste good oil and change the viscosity often either. What do you think?
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