I have one of those, 08 with a 3.8, 81K miles. Started using a lot of oil at 47K miles when my grandfather owned it, dealer changed lower intake gaskets and found that oil was getting sucked past 1 or 2 of the intake ports past the lower intake gasket. Fixed the problem for a while, it drinks 5W20, 5W30. Does well with 10W30 and 10W40 high mileage. Last time I put M1 Euro 0W40 in it, hasn't burned a drop of it and its never sounded so smooth or quiet on any other oil. It'll go through a quart of oil in 700 miles with 5W20 or 5W30.
Coworker also has one of these with a 3.3 and I've been using Rotella 15w40 in it since it's been badly abused and it's been doing pretty good on that as well. His has like 158K miles.
Coworker also has one of these with a 3.3 and I've been using Rotella 15w40 in it since it's been badly abused and it's been doing pretty good on that as well. His has like 158K miles.