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Looking at my 2001 jeep GC owners manual I'm wondering about this viscosity chart. Why would the 5w30 not cover the same hot side as the 10w30 for the 4L but not the 4.7L? Just don't make sense to me. Maybe I'm missing something, can you guys help me out with this?

Hi guys, New here and wanted to talk about oil viscosity and apply it to my 2001 yukon 2500 8.1L engine. as you know GM recommends 5w30 for about all their v8 engines around this time. The reason for this discussion is b/c this motor is also used in marine applications and has a different oil...