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Yeah, I don't know either. I can't remember which hole goes to the engine internals, but I think it should be whatever hole in the block that matches up with the channel in the cooler housing that leads to the center oil filter hole. I think it's oil pump, OPRV, oil cooler, then filter, so, yeah, if you could figure out how to force some fresh oil under pressure through there, but be really careful with cleanliness here. Anything forced through that hole goes right into all the bearings. The oil cooler should be easy to clean out once removed, and you might be able to backflush the oil pump, at least by rotating the engine backwards while doing so.
Let us know what you come up with.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky
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