My plan would be to make a stop every couple hours. Let it idle for a minute, turn it off, fill it up with gas, let it sit for 5-10 mins, turn it back on and idle for a few minutes, then back on the road. Go the whole way without cruise control and trying not to top 4k RPMs.
This will turn an 18 hour trip into 20 hours. Can't complain that much, either way it's a long trip. I can get the oil changed when I get there.
I just hope that several long periods of variable 3-4k RPMs won't hurt it. Now that I think about it, I did make a 400 mile trip in my TC (bought it at 212 miles) within the first 1k and it holds oil like a champ, never had any issues with it.
I'll get in touch with someone from the dealership and run this scenario by them and see what they say.