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You can use any oil for a short period of time but if you are considering changing the oil out completely with 10w40 you might want to reconsider because that is like going from water to molasses. It will damage your engine if you drive too long with it.
10w40 won't hurt anything at all. It certainly isn't like running molasses. Most auto manufacturers now recommend 5w30. But depending on your regional temps 10w40 is more than safe enough. If it gets extremely cold in the winter try to stick with 5w30. During summer months, or if you are located in the south the 10w40 won't harm a thing. As engines age and the clearances become more "loose" changing to a SLIGHTLY thicker oil can improve your oil pressure and buy you some time before a rebuild.
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