The upper intake will be the revised plastic intake (metal insert for egr passage) Even if it was leaking it would burn through the cylinders (and run like crud-misfire), or hydro-lock the cylinders. Coolant can still migrate into the oil here, but the above symptoms would come first. There is no oil cooler on this engine so no leaks there.
The lower intake gaskets are a known problem area and they can leak internally into the lifter valley. Timing covers are known to leak too but usually external. I really can't say stop leak products are good or bad, and most will not clog anything if used as directed. Some OEM's actually have their own stop leaks, mainly the pellet type, see below.
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