This has happened to alot of members (myself included with my SLE), so believe us when we say to drain that oil. Even if the coolant leak did not mix with the oil initially, it will pool inside the cylinders, which are not leakproof. That coolant WILL go somewhere else, like drip into the crankcase. Get those lower gaskets changed, if the upper manifold is bad you now have several options available to you, depending on how much you want to spend. Also replace the spark plugs and O2 sensor as they are contaminated now and will not run right until they are replaced.
Welcome, downwardly mobile yuppies, to the dawn of the Age of Nefarious.
1993 SSEi - FrankenJinx - dead and gone.
1994 SSE (136K strong) - 180* t-stat,HD alternator, most unequipped SSE on the club, XM radio, Kenwood CD/MP3.
2006 Chevy Malibu Maxx LTZ - Custom 2.25" manifold-back exhaust w/FM-80. Probably the only Maxx with this system.