Perhaps another test that might be closer to what we see in our engines is to do the same test that Dan did, but leave the metal in the hangar, not in the wind/rain.
Camguard publishes two cabinet tests:
https://aslcamguard.com/humidity-cabinet/
https://aslcamguard.com/api-derived-humidity-cabinet-testing/
The first simply cycles temperature, apparently to promote condensation.
The second adds acid to the water, and a 220F conditioning period, presumably to simulate the way Camguard is deposited on metal surfaces at shutdown. The rest of the test is like the first, to promote condensation.
The dipped strip samples are a "Let's see what happens" cousin to the basic humidity cabinet test. No controls, but it took about half a beer to set up while loafing in the shop one evening. It's not data in any serious sense, but it is an indicator. I did look at the samples every few days, just didn't take pictures. Want more precision? Go for it. In the meantime, does anyone have a link to real data from an independent source?
Ed Kollin spells out his position pretty well here:
https://www.supercub.org/forum/showthread.php?31190-ASL-Camguard
Kollin clearly has the chops.
I admit to being a bit amused at his discussion of MMO.
In the same thread you'll find a fella who tracks oil analysis long term. He reports no big change, before and after.
Anyone have a link to detailed discussion from Busch? A Bertorelli piece in Aviation Consumer seems to suggest Busch's primary evidence was no spike in iron following a period of inactivity. Apparently Busch wrote about it for the Cessna owners group, but I'm not a member.
EDIT: Thanks Bill, good read. Lot of merit to a dryer!
Interesting difference in reported results, Exxon Elite (which includes an additive package) vs Phillips w/ Camguard. Camguard's humidity chamber test on left, vs Sutton's results on right.