Oil for 2012 Jeep 3.6l. Hello all, new member here, and I have a question regarding oil for my first change on my new Jeep GC. Traditionally, I have changed the oil in new engines at about 500 miles to help in getting rid of manufacturing debris, and was wondering what every one felt about going to full synthetic at around 500 miles or should I 2012 Jeep Grand Cherokee experiences a faulty fuel system and is stated on consumer reports as the worst issue with this model generation. The fuel pump relay goes bad, and no fuel will enter the engine. This problem comes with an enormous repair cost and can be challenging for some users. To troubleshoot whether the fuel pump in the fuel The 2012 Jeep Grand Cherokee has 3 problems reported for engine knocking. or a new engine for $7800. Jeep knows this is an issue but chooses to do nothing about it. warranty had just went by View all 54 consumer vehicle reviews for the Used 2012 Jeep Grand Cherokee on Edmunds, or submit your own review of the 2012 Grand Cherokee. Now some nozzle is messed up in my engine $3,200 to 2012 Grand Cherokee 3.6l won't start. I been having this issue for the past week where my can't wont start with the control. Also it hasn't been starting when I go into the car and press the push start. It makes a weird sound but won't start. We eventually get it started but takes along time and it has become a big pain in the ass. After looking for a few months, we came across a great deal on a super clean 2012 3.6L 4x4 with 71,000 miles and fully loaded with panoramic sunroof and leather, etc. at a good price. I was hesitant to buy a 2011-2012 due to the common LH Cylinder head issue with the 3.6L. I had read that Chrysler made it right by extending the factory warranty The total trip the coolant temp was 230 to 250. Over the past 2 days to work and back it's been between 195 - 206. Decided to make an appointment with dealer to see if a fault code was stored and to make sure fan is working correctly. High temps and an aluminum motor are a bit concerning. engine problems 72 NHTSA complaints: 301; Worst 2012 Jeep Grand Cherokee Problems #1: TIPM Faulty 2012 Grand Cherokee Average Cost to Fix: $1,100 Average Mileage: 64,000 mi. Learn More 719JSu.

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