I have my 2012 Jeep Wrangler 4 years. I noticed that when it sits 3 days or more, it starts up with a lifter rattle. At 36000 miles I changed the oil myself and added an additive to keep the engine parts coated. I used Duralube. Rislone is another product I used on vehicles with lifter noise. The engine already has an extended warranty on a lifter or two. I don't believe the oiling system is adequate. They probably require synthetics.