I wouldn't be worried about who made the blanks. Once a camshaft is ground, it is surfaced hardened with the Parkerization process. That is what makes, or breaks - a cam - along with how well the installation and break-in is done.
Back in the 70s, General Motors claimed that most of their cam-failures were caused by improper break-in at the factory, not a bad hardening process. True or not, who knows and who cares at this point. Back then, we usually repaired engines with replacement cams from Crane Comp., and few other aftermarket companies. I've never had, nor have I seen, a failure problem with any of the afermarket cams when done right.
But now adays? Can't say.
In regard to engine oil, even the automotive diesel oils have the ZDDP anti-cam-wear ingredients lowered for removed. Only the racing, tractor, or European oils still have it.
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Today's Featured Article - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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