Which Rotella? There's T3 (Dino), T4(Blended), and T5 (full synthetic).
With flat tappets, run the T3 (has zinc ZDDP additive). If you're running rollers, the blended or full syn will work just fine.
A little off. T4 is dino, T5 Blended. I've run T4 15w-40 with a bottle of zinc in the hot rods for years. Also put in my mowers and T5 in my Victory bike. I'm a fan. It takes diesel abuse to 10-15,000 miles without issue. It's certainly good enough for our little motors.
