You really should have read that article I posted. A couple of excerpts:
Early in this research project, it was clear that there is little agreement on many facts relating to aircraft engine corrosion. There are even facts that go completely against popularly held opinions. The first and most obvious is the popular adage "oil and water don’t mix."
When an engine oil is exposed to heat, a process called "oxidation" is started. When oxidized oil is mixed with moisture as discussed earlier it often forms an acid which attacks metal surfaces.
The water doesn't just run down and under the oil. When the engine is running it mixes, since there so much oil being flung around in the case, and you get that frothy brown crud: an emulsion of oil and water. In the presence of metal it reacts to form acids. The process has been understood for a long time, and in automobiles the PCV system and much closer tolerances cleared it up. Aircraft engines, being air-cooled and needing larger clearances, and having high manifold pressures, can't use a PCV system, so that moisture that gets past the rings while the engine is warming up and clearances are still large, has to be driven off by flying the thing, getting the clearances closed up and having the heat do the job. Your 34V was flown from MN to WA and put in a hangar, hot, and didn't have any chance to build a bunch of moisture in the case before shutdown. Engines like that WILL be found clean and in good condition years later, as long as they're not ground-run in the meantime.
From
https://www.machinerylubrication.com/Read/14/lubricant-oxidation
...we read:
Lubricant oxidation is serious business. Not only is the lubricant’s performance diminished, the acids produced can increase corrosive component wear. It is important to understand the process and root causes of oxidation and the warning signals generated by oil analysis.
Sulfuric, hydrochloric, nitric, phophoric and carboxylic acids have been found in engine oils. I'm sure there must be chemists around here than can post the chemical formulae for the metal-catalyzed reactions between the oil, combustion byproducts and moisture that create the acids. Or we can just read the stuff the engineers publish for us and not worry about what molecules do with each other, but instead deal with the problem.
More:
https://www.machinerylubrication.com/Read/192/water-contaminant-oil
Not only does water have a direct harmful affect on machine components, but it also plays a direct role in the aging rate of lubricating oils. The presence of water in a lubricating oil can cause the progress of oxidation to increase tenfold, resulting in premature aging of the oil, particularly in the presence of catalytic metals such as copper, lead and tin.
In addition, certain types of synthetic oils such as phosphate esters and dibasic esters are known to react with water, resulting in the destruction of the base stock and the formation of acids.
It is not just the base oil that can be affected by moisture contamination. Certain additives such as sulfurous AW and EP type additives and phenolic antioxidants are readily hydrolyzed by water, resulting in both additive mortality and the formation of acidic by-products.
These acidic by-products can then cause corrosive wear, particularly in components containing soft metals such as Babbitt used with journal bearings and bronze and brass components. Other additives such as demulsifying agents, dispersants, detergents and rust inhibitors can be washed away by excessive moisture. This results in sludge and sediment buildup, filter plugging and poor oil/water demulsibility.
From
http://www.lubewhiz.in/lubrication_enemy_water_II.html
While water may not directly react with hydrocarbons, it helps to promote base oil oxidation, particularly in the presence of wear metals like Fe, Cu, & Sn which act as catalysts. In some types of fluids, water can react with the base oil resulting in the formation of sludge, acids and deposits. Control systems using Phosphate Ester fluids are particularly susceptible to such hydrolysis. Sulphur Phosphorus EP additives can release sulphuric & phosphoric acids in the presence of water. Water also attacks, hydrolyzes , agglomerates, consumes orsimply washes away a host of other additives such as AW, Rust Inhibitors, Antioxidants, Dispersants, Detergents, Demulsfying agents. Once such additive depletion has taken place rapid deterioration of lubricant & attack on machinery sets in. By-products of oil degradation can react with emulsified water to form resinious, sticky materials. Often, Sludge and Varnish formation along with the resultant restrictions on oil flow, valve stiction, bearing metal wipeout, etc can be directly attributed to the presence of water in the oil.
https://www.lelubricants.com/documents/resources/water_contamination_0509.pdf is a really good paper on what happens between oil and water.
I could go on, but maybe you get the point?