Well It Leaks AGAIN!
That's what I use, but I'm questioning why you think a 408 should have more blow by? If the rings are sealed, blow by should be almost none.
I've tested 400 Chevy engines with 13 inches of blow by and the PCV kept up with it. And that's a bunch of blow by.
I've also seen **** oils not seal the rings. Oil is what actually seals the rings.
