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10w30 will work fine. The benefit is improved mpg and better cold starts than 15w40. My owners manual says you can use 10w30 from 0-100 degrees. It was actually developed for the trucking industry so I wouldn't worry about pulling loads.
My current fill is Delo 10w30 and so far, the hot oil pressure has been the same as 15w40...
My current fill is Delo 10w30 and so far, the hot oil pressure has been the same as 15w40...