All oils still have ZDDP in them.. just not as much (800ppm seems to be the average for current oil) so there is always new zddp being introduced. That's why I like the idea of a first dose of nothing but pure oil and zddp.
Since this truck is (hopefully) going to be a daily driver I may go to an 'every other change' additive boost. I most likely will do an oil analysis at the end of the summer to see how the internals are doing.
If you watch some youtube videos of ZDDP:
They also test plain motor oil.. Exxon 5W30 and it lasted less than a minute:
