cancelled. Timing chain issues Mainly earlier production 2.8, 3.0, 3.2, and 3.6 liter engines with the three chain design suffered from premature timing chain failures due to a faulty PCV system and extended oil change intervals. Most of the problems occurred on pre LFX engines. See also List of GM engines GM High Value engine GM Ultra Engine References External links Technical article from AutoSpeed GM Unveils New Direct Injection V-6 - Ward's Auto World WebWombat article http://www.gminsidenews.com/index.php?page=Engine_Guide http://www.chevrolet.com/impala-4-door-sedan.html https://web.archive.org/web/20140109174626/http://www.chevrolet.com/2013-traverse-crossover-suv.html High Feature V6 engines Gasoline engines by model