Amazon does not need mass marketing for Amazon Basics, like Royal Dutch Shell needs to promote its Pennzoil brand in the United States. Here is your difference. Same thing with the rebates. Amazon does not need to sponsor enthusiast oil forums either. They don't need ads on TV either. All Amazon needs to do is sell its own brand of oil on its own site, and only its own site, and put the word Amazon on the jug of oil. That's it. They are soon to be if not already, America's biggest auto parts retailer. They are their own brand of oil too now. All they have to do is sell Amazon Basics oil for one dollar cheaper than a jug of Pennzoil sells for on Amazon. And by the way they make Pennzoil pay for sponsorship on Amazon, for product placement.