I would walk.... no no, not walk, RUN away from anyone claiming better fuel efficiency, engine sound and better acceleration, all this from a lubricant. I am surprized he did not also mentioned it also grows lost hairs.
I am not saying the product is bad, but trying to sell and engine oil based on the above arguements does not make me very receptive.
What are the specs?, API rating?, what kind of additive package does it contain?, is it an approved OEM product?
JackD