I run Mobil 1 HM 5W-30 in my '94 Hardbody without about that mileage. I bought it in '95 and it received dino oil at 3500-mile intervals. It still doesn't consume oil between 7500-mile changes these days. It's my third vehicle now, used mostly for farm work. Nonetheless, I plan to keep driving it until the wheels fall off.
If yours doesn't burn oil, stick with 5W-30 or 10W-30. Thicker oils cause problems with the timing chain tensioner on startup.