You may want to check out this video as to which is the best modern engine to have in your Jeep...

And what to avoid if looking to purchase a Jeep...

I run the 3.6 I experienced a Cracked Oil cooler from a oil change I paid for and spark plug change when the dealer put it all back together they cracked the oil cooler and about 15,000 miles later I lost the engine I spent 10K attempting to get it fixed and finally threatened to sue Jeep and they installed a brand new motor for me...

Now Im very particular about who puts on the oil filter and how... No issues so far and I just came off the 2 yr unlimited mileage warranty...

For the 3.6 oil leak fix, get the aluminum housing. Before 70k miles

When you want to swap your plugs, also swap the oil housing.

Tons of videos on how to do it, actually a lot simpler than you think

Ill probably pay a garage to swap them out and go aluminum next yr at some point... The engine replacement Jeep did ran 18,000 with the labor cost added in...

For out of pocket I would LS the damn thing moving forward... as long as all my electronics remained the same functionality...