If you are not much for synthetics, you made the best choice for conventional oil. Pennzoil Yellow Bottle known as PYB is the only conventional oil I would run in my hemi, except one time I used walmart oil as a flush. But yeah, something else to consider of what is going on with hemi lifters and cams, and Redline has proven itself in this area more then other oils. But PYB on a short interval is a sound strategy in my opinion, I would really at a minimum consider 5w30, about 1/2 the forum has considered the issue and choose 5w30 or heavier. Slightly more then 1/2 the forum uses 5w20 or 0w20 as the book says. If by chance that ends up being your strategy, I would really say consider a shorter interval, the oil is best when newer, viscosity improvers and detergents are best in the first 3k miles, then they loose their power slowly buy surely.
