If it's got oil in there it's probably sucking it out of the engine and will fail in time,
Here's some pointers,
Rev it to 3000 rpm, blip it actually, does it sound like a siren?
Can you hear a metallic scraping noise?
Look at the tailpipe, is there any white or blue smoke, you will see black soots with pre dpf cars circa 2009 and before
If you observe any of these it's pretty well on it's way, having it re-furbed is an option but they won't know until they split it open, if you take the intake pipe off can you see scouring marks on the body casing near the blade wheel?
If it's diesel when they let go they go into a runaway where the car runs on it's own oil until it runs out at max rpm then the lump goes bang and seizes, you can't save it as turning the key off doesn't stop it, iirc you somehow have to stall it to stop it.
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