Cadillac Repair: oil pressure, rubber gasket, golden honey

Question
Hello Tom,   I've got a 1976 Cadillac Eldo, 500 cu. in. eng. The car is not road worthy yet, but I have started it up and drove it around the block every month for the last 2 years. I decided it was time for it's first oil change under my ownership. I got 5 quarts out and put 5 quarts in( 10 w 30 ), as well as a new filter. I fired it up to check for leaks. No leaks, so I drove it around the block as usual. The engine started to get rather noisy as I drove, like there was no oil in the engine. Upon return home I removed the filler cap to look at the rockers, expecting to see SOME sort of oil flow or at least so splattering taking place under the valve cover - nothing. I checked the oil level and the dip stick read full, but the oil was still a golden honey clear. As if no ciculation was taking place. My immediate thought was my oil pump went bad... at the EXACT moment I chaged the oil...too coincidental for my likeing. I whipped out my Chiltons to try to find an alternative solution to replacing the oil pump, because I'm not convinced that that will be the correct path to travel. In Chiltons Cadillac '67-'89, book no. 7462, they refer to the oil pump as being above the oil filter. They say if you ever need to replace the oil pump you Must pack the oil pump cavity full of petroleum jelly so that no air is present, even between the gear pocket and gear teeth. " Unless the pump is primed this way, it won't produce any oil pressure when the engine is started " , from page 159. Now I didn't remove or touch any of that stuff, all I did was let it drain with the filter off for about 10 minutes and wipe the surface for the rubber gasket to make a good seal. Have you heard of this 'coincidence' happening before? I assume it is posible for me to have lost this 'hydraulic vaccum'in the oil pump, but that also seems far fetched. That would happen way too often. I'm thinking of packing the vasoline in the pump just because of what I read but not too sure That's the right thing to do. Do you have any ideas for me to try to figure out what has gone wrong?  Thanks for ANY suggestions that might help diagnose this problem, Rob

Answer
Just your luck or bad luck that the oil pump went bad just as you changed the oil. The gears in the pump are just plain wore out. What are you going to do, Pack the gears everytime you change the oil ?. Put a new pump in it and get the agony over with.