When running a track engine, the rules for proper oil viscosity kinda change. You are running very hot. So all you jockeys out there know, our favorite break-in oil is Joe Gibbs 15-50, that we run in all our PD's for a 500 mile break-in..
Also, the fact the 5-50 is not a diesel oil is really no consequence, as most race engines don't go 10,000 miles on a change. the soot concentration becomes a non-issue.
As for Schaeffer's oil, I don't think it's far from reality, that our PD cam kits, with the proper oil, which we think is Schaeffer's 9000 5-40, that Schaeffer's Oil company has noted an increase in usage since we have been promoting it. Our cam success is not because of a single improvement.
Maybe that's not the way some see it. When we are talking oil, everyone is entitled to their own opinion.