Well, during the PCV job if you're cleaning/reaming out the two passages in the engine block from above (vs. dropping the oil pan), then you're likely gonna loosen up some carbon deposits/sludge/gunk which will fall into the oil pan and contaminate your oil. After finishing my PCV, I ran the engine, took a couple short trips, and made sure I wasn't losing any oil (I had to replace a cam seal too). Then I changed my oil.
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