Hey RollGuy,
I have smelled the oil, and it doesn't smell burnt, but would that happen with synthetic? (Which is what I'm running). I've done the loosen injector test more than once, and it doesn't effect the sound.

Does that eliminate piston-slap as well, or just the injectors? I have heard from a few folks that piston-slap is not an unusual culprit. What say ye?