Our old pickup is a 2003 4x4 Tundra with the 4.7L V-8 (134,000 miles). I've used Mobil-1 / Delvac-1, both in 5W-40 (Texas heat) for more than 100,000 miles. Zero oil usage, zero leaks, smooth running engine...I just wich the gas mileage was better with this vintage 4.7L Toyota engine.
You can...