What does a engine knock coming from bottom of a 1993 del sol mean?

I'm thinking of getting a 93 Honda del sol but need to know what a knock at the lower part of the engine could mean

If it's a LOW frequency whub whub whub, that's the main bearing on the crank.

If it's a fast clicking sound, then it's likely a problem in the valve train, lifter, valve… Ect

Oil is cheap, engines are expensive. CHECK THE OIL!

It means new engine, in other words walk away.

It means the engine needs a complete overhaul. That would cost more than the car is worth. Walk away.

It means the person is selling the car before the engine blows, and doesn't want to spend the money for a rebuilt engine.

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