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owner's manual says to use 5W30, why would you use the 40 weight. The 40 means in hot temperatures the oil won't thin out more than 40 weight oil, so in hot weather, your car needs a lighter oil than 40. What happens if you use 40 instead of 30? For one thing your gas mileage in hotter weather will be worse because your engine will be working harder against that thicker oil and the thicker oil won't flow as easily around the engine so you will put more strain on your engine and possibly damage the internal parts.
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