@89Suburban the valve cover cut the oil consumption on my engine in half almost. The issue is that the OG valve covers have the inlet for the PCV right above one of the rockers. So when it goes into V4 mode the lifters shoot oil up the pushrod and it squirts into the PCV inlet, and gets sucked into the intake. The updated valve cover moves the inlet to the rear so it won't suck in the oil. My engine had 221,000 miles on it.
What if the V4 mode is bypassed with a Range Technology device?
How do you have it plumbed? Input of catch can runs to where, valve cover or top of intake?
2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18
It is plumbed correctly. Inlet to PCV on VC and outlet to intake manifold.