Nice truck, good choice, tell us how it goes. Don't use automotive oil for air filter oil. Air filter oil is thicker and stickier, it's designed to "hold on" to dirt and keep it from going through the filter. Automotive oil is thin and slick, won't grab as much dirt, and can get sucked into your engine. Do the right thing, it's not that expensive.

P.S. I'd like to see that race