I'm having a hard time accepting moisture entrapment of an oil filled sealed plastic container, to any amount, to be detrimental.
Well, believe it. Moisture permeation through High Density Polyethylene (the stuff oil containers are made of) is a known fact. Introduction of moisture causes the calcium (part of the detergent package) to drop out of suspension.
So the airborne moisture goes thru the plastic, but none of the oil comes out of the plastic, and once the moisture goes thru the plastic, it goes thruout the stagnant oil, and attacks/attaches to the calcium?
My loss, I'm just not there yet.
If for a simple test, if I immersed a sealed plastic oil container, I would see accelerated oil breakdown evidence?