[juanbenae]

The JK run from 2007 to 2018 had two different motors, from 07 to 11 they had the gutless 3.8L v6 from the caravan. Those motors will run forever but having just over 200HP adding big tires and a bunch of weight in bumpers, winches and such without regearing they can't get out of their own way. The 12-18 have the 3.6 Pentastar V6 is rated at 285HP, but is significantly less reliable. The 12-14's had problems with casting sand remaining in the heads and block that would clog radiators and other flow, in fact the sand would be deposited in the radiator overflow tank. The 15-18 got better in that regards, but they valve train on them stinks apt to wear and fail at a high rate. It's called "the dreaded Pentastar tick".

A contributing factor is dry starts due to the high oil filter housing with no check valve so the oil will drain back into the pan creating a 3 or 4 second oilless running at start up. I added an aftermarket Baxter filter housing that has a check valve and a spin on oil filter that oils immediately upon start up.

I've regeared mine with 35" tires from the OE 4.10 gears to 4.88s, and us an app to reprogram for tire size and gear ratios so the RPM and shift point get corrected as does the speedo.