Buick Lesabre Coolant Reservoir

We Replaced The Valve Cover Gaskets And Gaskets Under The Black Manifold And Under The Manifold Itself. Cleaned The Injectors Attached To...

There Is Oil In The Coolant Container Of My Car And The Fan Only Blows On High.. Can This Be Fixed? Thanks So Much

There Is A Black Substance That Looks And Smells Like Motor Oil In The Coolant Tank, Although There Is No Water In My Oil, And The Oil Does...