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On the 3.1 and 3.8 L engines the lower intake manifold gasket is known to leak due to poor choice of gasket materials. This is evidenced by oil oin the coolant. It could also be a failed bypass line that is dripping coolant into the crankcase. Last it could be a cracked block , head or blown headgaslket. Further diagosis is neccessary. The LIM is not a tough job but if you don't have the tools get the job done by a mechanic. Make sure that the cooling system is also properly flushed and re-filled after the repair.
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