[camarojoe]

I use Rotella, or Delo400, but to be honest, I sorta think alot of it is internet hype...especially in an engine that's been thoroughly broken in and just needs some fresh oil. Think about it, there must be several MILLION flat tappet small blocks running out there in the world, and only a few hundred owners (maybe a few thousand) have ever even heard of any of this "no zinc" stuff with the newer oils that has spread itself from one automotive internet forum to the next... They continue to use whatever they find on the shelves and drive away without a problem. If it was a brand new motor I'd be more concerned, (but then again proper cam break-in has ALWAYS been an issue with a brand new motor.) If its something with several thousand miles on it or more I think you can use whatever you want without a problem. In fact, I know plenty of folks that do this and I've yet to hear of any of them wiping out a cam or having any issues whatsoever.

I rank it up there with "lead additive" I used to religiously pour in my gas years ago at every fill up because at the time it was claimed the valve seats would be ruined if I didn't. Then I started realizing no one else I knew was doing anything but filling their classic cars up with unleaded and driving away... So I stopped and have never had a problem using unleaded gas. Maybe I just jinxed myself and my valves will melt into the heads and my cam will flatten out 3 lobes the next time I back the car out of the garage, but I doubt it!