diesel oil alternative?

i use this in the dart.. its made for flat tapped cams..

Joe Gibbs Driven HR-2 Conventional High Performance Motor Oil 02006

Joe Gibbs Driven HR-2 conventional high performance motor oil provides excellent startup and storage protection for small block engines and crate motors. Using oil additive technology developed for the US military's combat equipment, this multi-grade, high zinc content formula delivers proper anti-wear protection for older-style pushrod and flat-tappet engines. The same chemistry that's found in the Joe Gibbs Driven racing oil that has powered Joe Gibbs Racing to multiple NASCAR championships offers superior camshaft wear protection.