On the 2007 Chevy Silverado, the excessive oil consumption is actually a “known problem”. GM had issued a Technical Service Bulletin (# 10-06-01-008J) that states the most common reason for the high oil consumption is the Valve Cover and AFM Shield (and AFM Valve if necessary). Piston Rings on this engine are not a common wear or fail item, at all. HOWEVER, after the Valve Cover and AFM Shield repair is made, according to the Technical Service Bulletin, “Re-evaluate the oil consumption. Document on the repair order. If the oil consumption is still greater than 0.946L (1 qt) in 3,200 km (2000 mi), replacement of the pistons and rings will be required.”. So if oil consumption continues at an abnormal rate, even after making the recommended repairs, THEN the pistons and rings will need to be replaced.
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