[Fred T]

For additives, buy a bottle of assembly lube at the parts store. It contains the needed additives to keep your cam and lifters happy. Comp Cam has that on their website, but they recommend their own brand.

For oil viscosity, 10W-40 is not recommended for heavy duty use. It has been improved, but the polymers are not up to severe use. They still break down, just not as fast. Since you're in Tennessee, I will recommend 20W-50. I prefer the Pennzoil, it seems to adhere to metal better, but that's just my observation. 20W is a little thick when the temp gets below 10*F, so if you go north in the winter run 10W-30.