Yes, the same problem exists on the 3.0L. The Service Bulletin is there for the 3.0L as well.

The extent of the job depends upon where the leak(s) developed. First the valve cover gasket(s) need to be replaced. The parts and labor for that run between $250 -$400. The oil separator and hoses should be replaced as per the service bulletins. That could be around $400 on your engine. If you can, print out the service bulletins from that previous post and give them to the shop. If your vehicle is still under warranty or CPO warranty, then you might have this repair covered.