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    10w30 vs. 15w40: Is there a difference?

    My engine is a 4JJ1, in an Isuzu D-Max 4wd. Factory oil is Besco Duramax 10w-30. Other recommendations in the handbook are all 15w-40: Shell Rimula R3X, or R2 Extra or R2; Exxon Delvac MX; Caltex Delo 400 or Gold. And a few others listed. I ran the factory 10w-30 oil for for about the first 2...
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