Oil pressure does not cause leaks. Once the oil escapes the restriction of the bearing clerarance, gravity takes over and the oil drips back into the pan. Unless there's a scratch in the bearing that squirts a stream of pressurized oil right at a seal, I can't see where oil pressure would change the rate of flow of a leak.

The rear of the crankshaft has an oil slinger built into it, doesn't it? Sometimes the drain channels between the slinger and the seal get clogged with sludge and the oil overwhelms the seal rather than draining away. Some crankshafts also have a spiral groove that pushes the oil back in the direction of the crankcase that can get clogged up amd cause a leak. Good luck!
Jerry


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