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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
the 3.8 is only ''notorious'' to those who have had issues. the other 88% on the forum have had good luck with it. So far (knock on wood) I've got 65,000 miles, no issues. Almost all my mileage is a 75mph commute one hour each way to work.
If it is 88% that have no engine problems, a 12% engine problem rate is pretty darn high, IMO