There are quite a few possibilities when the head gasket blows. In one scenario the exhaust gases will leak into the crankcase causing elevated pressure and the pressurized exhaust gas will take oil vapor out through the main bearing seals since the main bearing seals are not designed to operate under that kind of pressure.
it could possibly have either a blown head gasket or intake manifold gaskets leaking
Possible cracked block or a blown head gaskets.
in the exhaust possibly but in the cabin more often means leaking heater core.
You cannot repair a blown head gasket, you must remove the heads and replace the gasket.
Yes.
Yes, a test strip is available that determines whether there is carbon monoxide in the coolant. If a headgasket is leaking the carbon monoxide from the combustion process will build up in the coolant. That simple test will determine if the head gasket is leaking.
The 1996 Saturn more likely has a blown head gasket. The gaskets will give this problem. If the head is in doubt it can be checked for warpage.
Blown head gastet, radiator leaking, thermostat needs to be replaced Blown head gastet, radiator leaking, thermostat needs to be replaced
if it has a sweet smell its antifreeze, heads or head gaskets are leaking/blown no cheap fix be sure to have heads pressure tested at a reputable machine shop
Blown head gasket or cracked head or both are a good bet.
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.
No It's not very common.