Well, at some point you HAVE to buy oil for a HP engine, why not get what you need? The price is about the same unless you're a real cheap bastard. I was told to go with Valvoline VR1 10W30 for my new build. Local speed shop has it for under $7 a quart. Amazon ships 6-packs for less than that. Talking with a respected engine builder last month when my engine was in the shop. He was talking about someone losing an engine after changing the oil with Royal Purple. This was a broken-in engine with some runs on it. Changes the oil, makes a pass and loses the engine (not sure what went wrong with it). He calls Royal Purple and tells them what happened. Royal Purple asks, did you shake the oil up before you poured it in? He goes back and looks at the containers... they had something in the bottom, probably all of his ZDDP. Anyway, I've never read the fine print on a bottle of RP or even bought one. But I will be shaking up any container of oil that has ZDDP in it.