Nothing personal but I came across this article: Source: Why Jeep Replaced Our 2014 Cherokee's Engine - KickingTires It certainly sounds like the Jeep service technicians have a different point of view. Bob Wilson
Probably failure of a part that allows vapors from the crankcase to be recycled into the intake for burning in the combustion process. The part is supposed to separate and return oil droplets back to the crankcase. The part used to be the PCV (Positive Crankcase Ventilation) valve and now can be called the AOS (Air Oil Separator). When they fail, you can also get fouled catalytic converters from unburned oil getting into them so ask about those too. Likewise O2 sensors that sit in the exhaust system. And last but not least, the MAF (Mass Airflow Sensor) that sits in the intake-manifold/pipeing. Clean manifold, throttle body, see if any in the air filter. Check plugs condition. Most of this should be unnecessary with the new engine. But I'd ask for a warranty extension on the cats, MAF and O2 sensors if they aren't replaced as part of the process.
