Been using Penrite Enviro+ 5W-40 in mine now for the past 4 oil changes and its due again so make that 5. No problems using this oil. Personally I think people go a bit over the top with type of oils as long as its a good quality synthetic oil, like you say Jeep don't even use the correct oil.
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MY14 GC LTD CRD Cashmere, OR Adv Pack 2, Uneek RockSliders, ARB Bar, Frontrunner RR, Nitto R Gs
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