Manufacturers spark plug broke off into engine and destroyed my engine. Vehicle only had 76,000 miles on it. When I ordered a new engine from Jeep there was a wait of 10 weeks with about 20+ people in front of me. I sent the spark plug to Jeep and they will not return it. I do have pictures on my phone. Theres still 20+ people waiting on an engine. This seems to be a massive problem with the vehicle costing people thousands. It should be investigated at the very least.