Some questions about engine RPM etc

good idea, i will check filter next time.
 
what are the symptoms? I dont feel any issues but I guess I am being too precautious

You could have a bunch of symptoms, here are just a few

Smoke from exhaust - blue/white-ish due to oil getting past the piston and into the combustion
Excessive oil consumption
Rough idle
Poor performance - worn/damaged rings result in less compression and thus less power
Excessive oil in the air filter as a result of blow by oil due to positive pressure in the case
 
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