"I was told"

Princess Valiant said
So help me translate this phrase that keeps appearing in ads....

"I was told" ..... means:

A. I really don't know and I don't want to research for myself

B. It's just something sellers say, so to be cool I will say it too

C. I do know but I don't want to say and would rather be vague in hopes that I'll get more money for the item im selling

D. None of the above, so tell me

For me, it's an unknown. The car I just acquired; the owner told me that the camshaft was changed. By the roughness of the idle, I deemed it true, but I don't know the specs of said camshaft nor does the previous owner. This is what "I was told".