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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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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