GM 5.3 Liter V8 engines are known to have lifters lock up and bend push rods or destroy the camshaft resulting in engine replacement or rebuild. GM’s fix is to replace the badly designed lifters with the exact same ones hoping that they will last past the warranty period thereby putting the entire cost of replacement on the owners. GM is well aware of the lifter issue but denies any responsibility. A simple google of 5.3 lifter failure will show thousands of complaints and experiences from various auto boards/pages. My Lifters went out while doing 75mph on the highways resulting in immediate slowdown with cars having to swerve to avoid hitting me while i pulled over to the side.