My friend had a 2017 Jeep up on the lift when I stopped in the other day. The rear main seal cover plate was leaking and causing a small puddle of oil on the owner's garage floor every morning. The job is about $1500, mostly in labor and requires the exhaust and trans to be removed. I had no idea rear mains are sometimes in a cover plate that bolts to the back of the engine. I was also surprised to see some varnish on the wet side of the cover plate with only 50,000 miles on the clock - you can see where I rubbed the varnish off with my finger. The yellow circle indicates where the plate was leaking.