Have an 09 SLT, was my daughter’s now my wife’s. 3.7, bought in 2017 with 146k, now at 184k. Bad head gasket from day one, uses about a pint of coolant a week. I manage to get the CEL off to get it through inspection but it always finds a new way to turn it on. Wife loves the ride. Lots of electrical issues to chase. Great in the snow even with the low profile 20” tires, I think the ESC and 4WD together help with that. Daughter’s key fell apart while she was driving and the alarm system wasn’t having any of that. The fact that she was starting to have to drive a lot for school while my wife is working from home made them swap as my daughter lost confidence in it.

Forgot , trans cooler is part of the AC condenser, I was not opening a perfectly functioning AC system so it got a Hayden plate cooler when the original one started leaking.
And it has needed a water pump, was one of the easiest I have changed.
Heater core needs to be flushed every fall too lol.