Just bought a 2014 JKS and was just curious about the engine. What's the major differences between the engine I have and in years past? In 2010 was it not a 3.8 L? Which engine is better? The sales guy was trying to tell me the new engine is basically the best jeep has ever put out and that it's ranked in the top 10 best/most reliable engines. Is any of this true or was he just selling me a jeep? I've always known jeeps to be pretty bullet proof from what I've heard from friends etc...
The 3.8 is known to eat oil and is pretty slow with the 4spd auto. The 3.6 is more efficient, more powerful, and you get a much better 5 speed automatic (if you're into autos). The 2012 MY eats cylinder heads, but the warranty on that is extended to 150k, so nothing to worry about. Otherwise, there are relatively minor and rare issues with the Pentastar that include water pump bearings, casting sand in the heater core, and cracked oil cooler housings.
The interior and tops are also much better on the 2011+ (although the 2011 has the older powertrain).
2012 Deep Cherry Red JKU Sport S - Tickastar, 6 speed, 3.73, Dual Tops