We use Gibbs Driven and have for about 5 years now. Have not lost one flat tappet camshaft since we started using it. I do get a kick out of people making a big deal out of the cost of their
oil that might get changed once a year on these kinds of cars. Spend big bucks on an engine and then not use a break in
oil or proper
oil after that.
Do not think you can just us a break-in oil and then go get the stuff made for a todays engines or you will lose a lobe after the fact. I have seen guys do that before. We ship the Gibbs stuff all over the country.
Good luck, Keith