thanks everyone. I think with what you've posted and further info gathered from him the problem is his bad habits and the nature of Jeeps.
I ask him what type of oil he used and he stated synthetic, not sure which weight. anyway, he has his oil changed every 10'000 miles with it.
I ask him why and he believes that synthetic can last that long.
I'm not an oil expert, maybe it will, maybe it wont. I told him he probably needed to have it done every 3000 miles or 3 months, whichever comes first, like it used to be. I try to do that religiously and never had any problems with my vehicles. Anyway, I made the suggestion, expressing that a regular oil change schedule is an easy try and it can't hurt, only help.
Maybe....who knows. Seems that low oil pressure on Jeeps is kinda common from how many threads I've read, and maybe running any kind of oil for that long might compound the problem. not sure, but something to try before spending time and money chasing a gremlin.