One problem related to engine oil leaking has been reported for the 2006 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 GMC Sierra 1500 based on all problems reported for the 2006 Sierra 1500.
Defective castech heads. Leaking antifreeze into engine. Thins out the engine oil and could engine to over heat or sieze up while driving. Gm knows of the defective heads but will not warrenty them. Please can someone please help us poor people who have got stuck with this bad defective design.