psneeld
Guru
New engine are shipped without oil and they may sit in a warehouse for a long time before actually being installed and started.
Same is true for all engine powered tools.
Are they assembled with special lube to guard against corrosion? My reading says yes...at least some. Similar stuff is used by some engine rebuilders too.
https://www.machinerylubrication.com/Read/29204/oil-base-number
New engine oils usually have a range of 5 to 15 BN. As oil is used in service, it becomes contaminated with acids, causing the base number to drop over time. By using oil analysis for your engine oil, you will be able to track the BN of your oil and determine how much life is remaining. Once the base number drops below 3, this is considered too low and should trigger an oil change for your engine.
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