2012 JK engine pic

Yeah, about all the automakers are using plastic now. The block is aluminum with cylinder inserts exhaust manifolds are incorporated into the heads. Google 3.6 Pentastar and check out the allpar website and they give a pretty good write up on the motor. I can say that so far I am happy with all 500 miles I've put on my new jeep.
 
Good to hear about reliability, cause part of the deal with my wife when I got this one is I have to keep it for at least 10 years.
 
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