Somethings I've read it can be:
Connecting rods, timing chain, flywheel, Fuel pump, I have a hard time believing any of that.
Since I could distinctly feel the tapping at the bottom of the pan, and the pickup screen is even closer than normal I think it's an oil pump problem or resonance. Now, who's changed their oil pump with the motor in the car? I can readily access four bolts, don't know if that will get it off, but they're coming off, then will go from there.
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