I round a Pontiac Grand Prix on Craigslist on a dealership. I went to look at the car and the guy said that the Intake Manifold Gasket needed to be replaced. However, there is water in the oil which leads me to believe that the Head Gakset is what is bad on it. I do not believe that a bad Intake Manifold Gasket can cause moisture to get in the oil. I need to know 100% what is wrong with this car before I can buy it that way I know how much money I have to put into it. Any advice helps. Thanks!

 

if its a 3.4 v6 its very very common for the intake gaskets to leak. Though ive never really seen any leak into the oil at least badly

 

it is a 3.1

 

same motor really

 

all 3.1,3.3,3.4 engines have intake leak issues. Every one will leak one day, I have seen them with water in the oil because of the intake

 

My 3.8 did it as well cost 240 dollars in supplies for me to fix it.

 

well series II 3.8s were known for the plastic itself cracking inside and leaking