Pre-mature failure of rod/main bearings is often attributed to oil starvation (low oil volume, blocked oil passages, bad/old oil) and some of these engines have been prone to "using" more oil between changes than others. That is why some engines are replaced when the rod/main bearings fail prematurely and others are replaced because of high oil consumption. The concern here is that some engines use oil at a higher rate than typical and end up killing the bearings from oil starvation. Typically modern engines can go a 5K mile oil change interval without using more than a quart of oil. Most 2.4L engines can, but an unacceptable percentage of these cannot. And the first indication the driver gets that oil usage is above normal is the knocking of the rods or the "Check Engine" light coming on. In this case, "Check Engine" can mean "check the engine carefully so you get the right one to replace this one that just bought the farm."What has oil consumption have to do with it?
GENERALLY speaking, an engine with worn rod/main bearings can be kept alive for a while with a higher viscosity oil. See STP. But worn rod/main bearings will eventually fail whether due to oil starvation or just plain high mileage end of life. Back in the day many a high mileage engine had it's life extended by replacing rod/main bearings, piston rings, cylinder honing, and if needed, a valve job. Now the labor costs are so high it is easier to just pick up a low mileage used engine or a quality remanufactured engine.