They say that seeing is believing. They also say, don’t believe everything you see. Contradicting huh? Well the same is true of new oil.
An unopened barrel of oil straight from the supplier ought to be pretty clean right? Wrong! In fact, new oil has an ISO cleanliness code of around 20/18/15. This is just about OK for the most basic of pumps, like a screw pump. But if you’ve got piston pumps, gear pumps, hydraulic motors, not to mention proportional or servo valves, you’re going to need to filter your ‘new’ oil before putting it into your tank, or you could wind up actually INTRODUCING contamination into your system, and making it dirtier than it was to start with!
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