Then there is nothing major afoot bud but find which hose is feeding oil off the rocker cover, the only true way to clean the inlet is to remove it ,split it from the throttle body.
Give it a deep clean ( i’ll dig some pics out) with some product we use and recommend Mazdamenders jizza clean, and just re fit ,job done , it is easy enough to remove to do the job correct.
M-m
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