We have all heard the same stories of ND motor oil etc. If you put one drop of ND motor oil between your thumb and index finger and SLOWLY pull them apart, you will see how far your fingers separate before the oil drop breaks apart. 20 wt. oil will separate sooner (closer together) than 50 wt.
Now try that with Pell gun oil and note the relative viscosity (distance)before the lubricant column breaks apart. Keep in mind that the distances involved are going to be small and requires a Steady hand. But after awhile you will notice differences.
Now get your hands on some type of 'STP' or 'Motor Honey' oil additive (for high mileage motors) and try the drop viscosity test (now you know why they call it motor "honey").
Now get some ATF Dexron (red) and test.
OK! one is way too thick and the other is too thin in relation to our benchmark Pell Gun Oil 'viscometer' (your finger tips).
Now mix approx. 50% STP and ATF (automatic trans fluid) and see how close you can match the Pell gun oil. Keeping in mind that Both products you are mixing are Non Detergent and seal friendly, red in color and have that same distinct fell of 'stickiness' that Pell gun oil has.
Nothing else I have ever felt has that same 'stickiness' (Long chain Molecular weight) that 'STP' and 'Pell gun oil' BOTH have.
History IS the Preview of the Future, don't Forget any!