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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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