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Testing products is always a lot of fun. I would recommend that you do some research on standardized practices for testing oils and greases. Simply squirting oil on an arm to see how it functions is a pretty poor and meaning less test. It would be inconsistant and would not yield any conclusive data.
I do a lot of testing of materials in my job. You need to establish what properties you would like to test that are relevant to a firearm. Then research standard methods for testing these. Now granted some will require equipment and processes out of your reach, but they will help establish good procedures that can be done at home. By doing this you will glean much more quality usable information from you tests.
properties to test-quick list
Lubricity- very important (I have a tester somewhere if I could find it)
Corrosion prevention
Boiling point- if you heat up your arm is it going to leave
Pour point (low temp)
viscosity
cleansing effect
degradation with time
gum formation
dirt attraction and grit size holding ability (generally related to viscosity)
Now are you looking for one oil to do all or best in classes. I could be wrong on this but a good quality low viscosity synthetic motor oil probably will exceed most gun oils in most catagories. Also a good quality wheelbearing grease probably should be added to your list to.
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