Oil Change - Mileage or Percentage?

[Ironhorse]

Wondering how others schedule an oil change in the GMT400 vehicles and newer. For a good number of years since I've been driving, I always changed at the 3,000 mile intervals while keeping an eye on the oil level. If it was below a half quart I added the needed oil in between the mileage intervals. Never let it get below the half quart level.

The 5.3 LS was the first engine I encountered that used an actual percentage countdown for scheduling an oil change. What if anything changed that the 3,000 mile interval would no longer be warranted? I do no hard driving, dusty road conditions or heavy load pulling of any sort is done. Normal in town driving and occasional trips to Wichita, about a 100 mile round trip to and from with running a few errands in and about Wichita. I use 5-W30 full synthetic and Wix filters in my '05 5.3 Tahoe.

What's your oil change standard in the 5.3 LS and newer engines?