Well, I suppose it is good to be fussy....if you can afford to be .
I have the 3.8 engine in the JKU Rubi which has now done 230000 km mostly off road, in the deserts and pulling a van or trailer. It is almost always close to or over maximum weight when I consider the gear I carry (water; fuel tyres tools, food etc). It has often been driven for anything like 8-12 hours per day to get to where I want 2B and often in temps 30-42C.
I use 10W40 oil ... whatever brand is on special. I prefer a semisynthetic or synthetic version. Change oil and filter myself every 10000km ...still going strong!!
I can't imagine a 3.6 would be much different.
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