LS engine block porosity causes oil leak

Concern: Engine oil leak on GM 5.3, 5.7, 6.0, 6.2 and 7.0L engines (Vortec Gen III or Gen IV V8, aluminum block). Upon initial diagnosis, it may be determined that the leak is coming from the rear engine cover gasket. However, this condition may be caused by engine block porosity on the sealing surface. This bulletin applies only to engines that feature an aluminum block.

Models affected:

2004-2007 Buick Rainier

2008-2009 Buick LaCrosse Super

2005-2010 Cadillac CTS-V

2007-2010 Cadillac Escalade, ESV and EXT

2003-2009 Chevrolet TrailBlazer

2003-2010 Chevrolet Corvette

2004-2006 Chevrolet SSR

2005-2010 Chevrolet Silverado, Silverado SS

2006-2007 Chevrolet Monte Carlo SS

2006-2009 Chevrolet TrailBlazer SS, Impala SS

2007-2010 Chevrolet Avalanche, Suburban, Tahoe

2009-2010 Chevrolet Colorado Pickup

2010 Chevrolet Camaro

2003-2009 GMC Envoy

2003-2010 GMC Sierra2004-2005 GMC Envoy XUV

2007-2010 GMC Canyon

2007-2010 GMC Yukon XL, Denali, XL Denali

2004-2006 Pontiac GTO

2005-2008 Pontiac Grand Prix GXP

2008-2009 Pontiac G8 GT

2009 Pontiac G8 GXP

2005-2009 Saab 9-7X 5.3i

2008-2009 Saab 9-7X Aero

2003-2010 Hummer H2

2006-2010 Hummer H3

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