Im sure yall have seen my posts regarding the oil for the 4.0L in my jeep. Running 10w-30 in the winter and 20w-50 in the summer gives me good pressures but id like to find something that i can use all year and the 15w-40 has been coming up alot. There are post about clogging up the Cat, hurting bearings b/c the tolerances are too tight, and other issues that would go along with a heavier oil. The temp currently outside is 15 degrees farenheit and that is about the coldest it gets but in the summer we routinely get 100+ degrees with very high humidity and it makes for very crappy engine conditions (as far as power and wear/tear). I already ordered a bottle of auto-rx and have about 1500 miles until my next sched. change and will drop in the auto-rx when i have about 1K to go and would like to start putting in the 15w-40. My only concerns have been pressure (low when ive been driving for a while and its hot outside- above60 farenheit), and a slight rear main leak. Ive been running dino. Lemme hear your opinions. Manual calls for 10w-30 for my climate. This is a rebuilt engine. Thanx
