Can I use Lucas 30W break in oil, as a continuous use oil? In a 340? It contains lots of zinc so I think it should be good. I test ran it to break in the cam, and drained it out, and I planned to put another 5 quarts in to use for running. Any reason not to? (disregard outside temperature) I also have some zinc additive that I will use at some point in the future, mixed with some regular, modern, oil.