FWIW, I installed JE rings on Omega pistons, then ran the engine in on an engine dyno using
Millers competition mineral running-in oil.
Of course, we had the luxury of running the engine in a completely controlled and monitored fashion....ran with this oil for the first 2 days of mapping (not full-load though), then drained and switched to Joe Gibbs per LN's recommendation (I'm also running their 98mm Nickies)