Mystery Oil Loss - Where is the oil going? 2008 Yukon Denali

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rdezs

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Kind of sort of full bore.... But actually through a metered orifice on the models without the PCV valve. Not sure what year they drop the PCV valve, around 2004 or 2005?

That orifice is built into the driver side valve cover. if you have a lot of blow by it could potentially get plugged fairly easy. You can see the orifice if you pull the hose off and look straight down into the opening. You can clean it with a small drill bit. I wouldn't recommend enlarging it, will probably suck a bunch more oil into your intake
 

Fless

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Best to do the valve cover TSB like @donjetman posted in #15.

My 2004 does NOT have a rattle PCV valve, it's integral to the DS valve cover.
 

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