can oil get into the coolent, by a failing lower intake manifold gasket

Until you can explain how the lower intake manifold/gasket (obviously this is the 3.4 V/6) can put OIL into the COOLANT system in any way, I have to 'respectfully'... but open-mindedly, disagree!

To be honest I did not really pursue the how. I found it quite unusual as well. Since the complaint is oil , and transmission fluid - there are no oil cooler lines to the radiator on my se. If there was a large quantity of "oil" I would agree , especially if it is red or brownish. A very small amount of oil in the coolant is what I observed, less than a quart.Just enough to film up. A possible scenario is it would have to be drawn in by a vacuum.From the cooling system on cool down. Alternatively it is also possible it is a more serious issue such as a head gasket. Please tell me you have never seen this either. Despite what a corporate attitude would imply a quart of oil per 1000 miles on an engine with only a mere 60000 miles is not optimal . It does deserve some attention. Since the exact question was is it possible, my mind says well yes , just not that likely. In the several hundred intakes I have done, my own is the one and only sad and lonely, so I do see where you are coming from _but I disagree, That engine begs for attention , if the transmission slipped you would be validated. That is my opinion. Additionally these engines , along with the v-8s on occasion had issue with porous castings. Since these engines are a matter of when ,not whether as far as the lower intake gaskets go, it would seem to be an odds on favorite. External leakage is the smoking gun , just wait for it.

Kinda odd that there was or is no reply from the original posted question!.... Maybe they got rid of the car....

You never know Pushrod.