People often speak of a particular oil making their engine sound louder. In my opinion more engine noise is not a good thing. On this forum people find it acceptable as long as it is their favorite oil causing the noise.
Example, 'yes Mobil 1 makes my engine seem much louder, but its a synthetic which tells me it should be better oil, so this clanging metal to metal grind I am hearing is really just the superior addictive package protecting my engine better.' That isn't a direct quote, but a paraphrasing of what I read here.