I work a fleet of 150 cars, over half are Tahoes with the 5.3. We rarely get oil leaks and when we do they are easily fixed. None of the other precinct mechanics report ongoing issues with leaks either. I'd guess that's at least 1,000 Tahoes with 5.3s and no nightmare oil leaks. I'll bet I can find internet horror stories about just about anything if that's what I'm looking for. I'm sorry the OP is having issues but my experience with the LS platform is much different than his.