You could set up a garage-based business where you are buying in bulk (drums, probably would be best) and storing / distributing / bottling it yourself. You probably would not be able to claim certain certifications without a licensing fee, maybe sending samples out for test, and other expensive obligations. I have no idea if bodies like the API require a membership / licensing fee but usually that's how these industry-supported bodies work.
You could, of course, lie about it and wait until someone complained ... wouldn't be the first time for retail oil bottles. If the business makes money then you could pay for the legal obligations. That's pretty much the business model used by immigrants, by the way. Start out by skirting the rules and go legit when the income warrants it.