I would stay with dino on that motor and not go to a synthetic with those kind of miles.
Just make sure the motor is clean, run some auto-rx through it and put it on a diet of good quality dino, or diesel oil.
Use a good filter. Motorcraft is what you want, purolator if you can't get motorcraft easially, supertech if you are on a budget.
I would run chevron supreme 10w30 or chevon delo. Or even a mix of the two, lol.