I've been putting 10w 30 gtx in my jeep now for about 2 years with out any problems, in the summer i also use a half bottle of lucas engine treatment with every oil change...it keeps moisture in all the seals and boosts oil pressure a little bit, it works great...during the winter season i use an additive from BG with my oil changes, its not as viscous as lucas so it works good in the cold...it does an excellent job cleaning out the sludge.

 

Thanks Everyone!