I also have a 4.4L (2006) with valve stem seal issues. After an extended idle of 1-1.5 minutes will see a puff of blue smoke at takeoff.

However, I have been checking on a regular basis (dipstick) and over the last year have been needing a quart of oil every 2,500-3000 miles depending on the whether it was mostly city or highway driving.

At this point hoping for the best long term. Pretty hard to justify a 6,000-7,000 repair unless someone knows a mechanic in the Milwaukee area willing to tackle the job for half of that.