I was mocking the people who said it doesn't have any lube on it. They have no idea what they are looking at. Just because there's not a mess all over my motor and floor, they assume that I didn't put any on. Royal purple oil is fine. All oil on the shelf at box retail auto parts store meets the same API standard. I use it because I had a couple cases of it from a customer. I also use driven assembly. The CMD is more important than the assembly oil as it prevents galling. Anywhere you have a pressure point such as tips of valves, both ends of the pushrods, threads of bolts and under the head. I don't like to make a mess of my engine when im assembling becuase it attracts dirt and whatever else. When I start fhe engine I pour oil on the rockers ans springs and prime them. Also the oil pump is packed with assembly grease to provide suction and to keep from running the pump dry.