Right now there are 56 deals from Amazon Resale, formerly Amazon Warehouse Deals, in Automotive › Oils & Fluids › Additives. These are inspected returns and open-box items that Amazon sells and ships itself. WarehouseHunter puts each one next to its current new price, so you can see what you save at a glance.

Brands with the most offers here: Hot Shot's Secret, Lucas Oil, STA-BIL, System, Diesel, Red Line, Bar's Leaks, Chevron. Every item is a one-off, so the stock moves all day and new deals keep arriving.