How does new oil get contaminated?
Collecting contaminants during production and transportation, bulk oil can be transferred from production to storage to trucks to containers to drums multiple times before arriving on site.
New Oil is one of worst sources of particulate contamination ingression in fluid systems, because most operators assume new oil is clean, it is freely introduced into the system.
A common cleanliness code for new oil is 22/21/18 or higher, which is NOT suitable for most hydraulic and lubrication equipment which operate on finer tolerances of 16/14/11 or cleaner.