04 Yukon XL burning aprox 1 qt per 1000 miles...no apparent leaks

[S33k3r]

If you have white smoke, and it is a coolant leak... Well, we now know where the oil is going...

 

[03yukXL]

Pull the plugs and look at them. Do a compression/leak down test. That will give you answers. The pcv is 3 dollars just replace it no matter what.