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Check the 4 bolts for the oil cooler that fasten it to the oil pan. Seriously.
You are right - the lines are for coolant flow through the cooler block. The cooler block circulates coolant and oil (separated from each other of course). The flow of oil is from the pan, into the pickup, through the pump, through the block, into the pan, into the filter, out the filter, through the cooler and into the engine extremities. Something like that.
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