Assuing yours is a V6 . . . quote from Olds Forum . . .
"April 24, 2006: General Motors has been slapped with a class action lawsuit in Canada. The suit comes after this CTV Whistleblower report that revealed problems with a small engine part in millions of GM vehicles. The lawsuit alleges GM is at fault for the failure of intake manifold gaskets in several of its vehicles.
It's a simple component buried deep under the hood -- in some one million General Motors vehicles sold in Canada alone. It has the potential to cause huge headaches though, for the GM vehicle owners.
It's an intake manifold gasket, put in at the GM factories, in some makes and models between 1995 and 2003. According to GM's own internal service bulletin, the part can "degrade" -- causing coolant to leak -- sometimes into the engine. Several vehicle repair mechanics told CTV that in the worst case scenario, the coolant mixes with engine oil -- making the oil ineffective -- and damaging the engine.
They say in extreme cases, the engines overheat and seize completely"
Looks like you do need an intake manifold gasket, sooner rather than later!!
HTH

Welcome to OOF by rhe way
