Quote: I know this is a racing forum, and Hyd rollers are not normally found in racing apps, but does a HYD roller get a free pass on the zinc issue? I mean OEM's are making rollers live/work?
I'd think that's an "It depends" kind of thing. OEMs run hyd rollers on pretty mild cams that have to meet certain service life requirements for a production vehicle. But once somebody swaps out that mild sh!t for something aggressive, then what happens if you still use a modern low zinc street oil?
