Automobile(s): White Diamond 06 STS V8 RWD 1SF F55 HUD/ACC NAV - 139k
I paid $56 for a 6qt. Mobil 1 oil change at my local GM dealer for my 3.6l CTS...OP, how does your intake look? Full of oil? It's the "PCV" orifice on the passenger side valve cover...gets plugged up and then oil gets sucked into the intake...have you looked into an oil catch can? This is why the 3.6l engines like to blow timing chains...GM design flaw.
Harley04, Here the scoop. My 06 STS V-6 was burning oil at rate of 1qt. @ 760 miles. Lucky it was under warrenty. Cadillac replaced the piston rings. Now 30,000 miles later still burns no oil. You could add 1 qt. of oil every 2,000 miles and never have to change oil again. Danny