Interesting thread. Just picked my son up a 2011 Jeep Grand Cherokee with the Penta star. Transfer case seals appear to be leaking. Front diff too. Thought it was the dreaded oil cooler but I dont see the oil coming off the backside of the engine (yet). A little bit of pooling in front of the filter housing, but that could have been because of me changing the filter.
Used Amalie synthetic 5W30 and a Mopar Filter. Plan on doing 5,000 mile intervals. Unit has 103,500 miles on it, previous owner said he did oil changes every 6,000 miles using a synthetic...didn’t ask him what kind...most people are not bob is the oil guy enthusiast, and what find it strange if I stated asking about base stocks and HTHS ratings.
When I drained it the oil was around a quart low, no idea how many miles were on the oil but if I had to guess...5,000 or more.
Plan on doing a tranny service (pan drop and filter) soon, not sure what tranny is in this thing, but from what I’ve gathered, Mercedes makes the transmission. Hopefully it takes the ATF+4...I don’t want to go searching for special fluid.