we have oil on top of the intake manifold. would that be the top intake seal on 2004 Pontiac Bonneville

smell antifreeze when the car runs and slowly losing antifreeze. nothing in the oil.

2 answers
very common problem with this era GM cars due to dexcool antifreeze eroding intake manifold gaskets,replace upper and lower intake gaskets.
have it daig 1st but pace guy is correct