One problem related to engine oil leaking has been reported for the 2005 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 GMC Sierra 1500 based on all problems reported for the 2005 Sierra 1500.
Engine oil leak on or around rear main seal. As oil drips while driving the oil lands on the exhaust pipe and begins to burn. This leak landing on the exhaust while hot can catch on fire.