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Re: 1997 3.9 Engine Knocking
If the bearing are worn (or spun) the oil pressure will drop off significantly after the engine warms up. That is why I had asked how the oil pressure was. Since the pressure is holding high and steady, one can safely assume the bearings are okay.
The 20w-50 is another story. If the PO ran it year round, it would've prematurely stretched/worn the timing chain and it's gears. (In the winter 20w-50 is like molasses until it gets hot.) This is due to the fact that the oil pump is driven off of the camshaft, which in turn is driven by the timing chain.
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