What oil for solid lifters?

It is sad what has happened to oils. It is true that diesel oil has the most amount of zinc diphosphor sulfer (they claim pollutes the air). They have to run so many miles the EPA left their oils alone for the most part. Anyway, most diesels have roller lifters.
Solid lifter cams generally use higher spring pressures on the nose so the critical time is the initial start and break-in. The old moly lube was OK but it tended to plug oil filters and required changing the oil right away. Absolutely the best product I have found is Torco MPZ to coat the moving parts on assembly. It looks like red jelly. It contains proprietary ingredients but it certainly contains zdps. I researched them going to torcousa.com. Lucas Oil Stabilizer also has the anti wear ingredients but not as much as STP!
Back when I was drag racing, Valvoline (Ashland Oil Co.) gave us free 50 wt racing oil for the Hemi. Castrol approached and gave us their 20/50 and I loved it. I still use it today. It had the greatest pressure stability at the finish line compared to the starting line. Today, when I'm not running rollers, I use serious solid lifter cams with the highest possible spring pressure. I have never had a cam/lifter failure with the Torco MPZ and the 20/50 oil with either STP or Lucas in subsequent oil changes. I believe that Comp Cams now includes the MPZ with their cams.
Pat