It sounds as though it could be a rattle from the big ends.
You say you have low oil pressure. This could be because of the revs going up and down at idle. Or worn big ends.
If you can rev the engine with the bonnet up and listen to the engine. Where does the noise, if any, seem to come from ??
This will give you an idea as to whether it's the engine or box.
One other thing that can give this sort of noise is a loose heat shield on the exhaust system.
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