Oil Ration — a dashboard for motor-oil limits

Field notes

The dashboard combines retailer pages into a product-level view of purchase restrictions, with entries sorted by the visible cap and accompanied by package size and price-per-quart data. Its current snapshot covers 418 read listings and shows Costco and Sam's Club as the retailers with observable limits, while several other retailers cannot be confirmed because their carts are not queryable. The page explicitly distinguishes online prices from in-store shelf prices.