Shirley, No PVC valve on the 06 CTS. They do have vent hoses but the PVC valve was eliminated for more or less hollow fittings with a bit of taper to them that gives very little restriction. Check the attached links,forums, instruction and guides, Good luck
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Oil consumption and possible PCV valve addition Page 2
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1336997
3 6 oil consumption Cadillac CTS STS 2005 04 09 SRX CTS Sport Wagon Sigma
There is no PCV valve. Its replaced by some sort of metering tubes.
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