I have used the OLM on every vehicle I've ever owned that's had it. I can say with confidence that I've NEVER had an oil-related issue with any of those vehicles. I've done regular level checks, and topped off when needed, but other than that...
On average, though, it's around 6500 miles when the life left gets "low enough" to worry about. Oil was dark gold in color when changed, but nothing black and nasty. But it's been all Mobil 1 and either a mobil 1 or Wix or GM filter. No issues, so no need to change brands.
2010 2SS/RS Auto, Sunroof, Engine Cover. Transformer Edition package.
2013 ZL1 ragtop #5478. 1 of 54 CRT M6 'verts.