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That sound you hear doesn't have so much to do with oil pressure as it does with cold cylinders. It takes a minute for cylinder combustion to smooth out. I've had 6.5L GM diesels that wouldn't quiet down for close to ten minutes after start up.

You only ever need to pre-pressurize oil into an engine that was freshly built. Using a system like the one you speak of will only increase the chance of contaminants entering the critical bearing surfaces. I've pulled apart diesel engines that were left sitting without being ran for more than...