If it held 6 quarts with a shallow pan, now you swap to a deep pan. Run the same 6 quarts. This places the oil level lower, away from the crankshaft. That is a performance upgrade.
Not sure that's true. If the crank will hold 3-4 quarts in suspension at speed then the depth of the pan really doesn't matter. That oil won't make it back to the pan once it's pumped out. Now add a crank scraper and you might be on to something.
