It's most likely for the drain back. It should use the engine oil pump to send oil to the turbo, but because the turbo sits lower than the oil pan the drain back must be moved with a pump, because gravity feed wouldn't work.
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99 Atlantic Blue V6- SOHC 4.6 swap, Tremec 3650, 8.8 rear end/ Flowtech Ceramic LT headers, off-road x-pipe, Spintech side exit exhaust. K&N drop in filter, removed snorkel, 18x10, 18x9, Anthracite Bullitt Replicas 295-35's, 265-35's. Eibach Pro-Kit springs, M&M Camber Plates
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