Can i switch to a thicker oil for my Jeep?

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YeahSorry

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i was told to switch to a thicker viscosity oil to help with the problems of my 88 jeep cherokee pioneer, (4x4, 4.0, 6 cylinder). Is this really okay? it takes 10w-30 now. will switching harm my engine or any other parts of my jeep? any knowledge or advice?
what can i safely switch up to?
 
You should not have any problem moving up to a 15w-40 and in warmer climates you could move to a 30weight with no adverse affects.
 
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