you put your gasket on wrong and it didn't seal.
it could possibly have either a blown head gasket or intake manifold gaskets leaking
They are gaskets under your valve covers that keep oil from leaking out.
I'm assuming your grand am has a 3400 v6 which are known for intake and head gaskets leaking. so its possible that one of those gaskets are leaking so bad that coolant is leaking from intake/heads down onto your valvetrain and then down into your oil pan. more than likely its your intake gaskets leaking.
If it's not due to rain, the heater core is probably leaking.
Several reasons... It is produced by combustion. This normally will go out the tailpipe if the car gets warmed up. Condensation. Moisture from the air in both gasoline and oil. Leaking gaskets. Not as common, but can come from coolant. Bad thing, getting coolant into rest of engine.
Most likely you have a blown had gasket.
Coolent leaks from pasenger side of engine.
if it is lowering oil and water both and is not leaking it may have a blown head gasket and it is going out the tailpipe
If a transmission is leaking fluid, it is likely that a seal or gasket has failed. Replace the gaskets and seals and the leaking should stop.
Your gaskets are leaking and you are leaking antifreeze inside the manifold. Same thing happened to me on my silhouette and cutlass. The problem is the orange anti-freeze eats the gaskets. Will cost $2,000-to-$3,000 to fix. Sorry!
Could be the intake manifold gaskets are leaking.
Leaking valve cover gaskets?