2 opinions and experiences:
1. I had a 94 Mustang GT with 163,000 miles on it. About every 1000 miles I would have to drop the pan and replace the oil pick-up tube that was clogged from gunk. The motor would clank, clatter and knock with no oil pressure until I changed the tube and pick-up filter. I changed the tube one last time, sold the car and bought the 71 GMC 4X4 that started me on this old truck kick.
2. You were running the truck harder than a virgin on prom night. The oil got hot and lost viscosity (turned to water), then when cold and thick again, it worked fine.
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