I don't know that I'd bother with Rotella, although it won't hurt anything.
There's also nothing special about GTX, although I would use a 10W-40 in this engine, as I did with our now long departed old Civics back when they were new Civics.
Drive the car regularly, treat it to a couple of 3K OCIs and the engine should clean up noticeably.
Maxlife or Defy would probably both be good choices for this engine.
Expect some teething issues from a car that's seen little use in its three decades since coming off the boat.