Entrepreneur Follow Costco’s Motor Oil Price Jumped From $30 to $58. And Now There’s a Limit to How Much You Can Buy. As oil prices continue to rise, Costco puts the brakes on how much shoppers can stock up on. https://www.entrepreneur.com/business-news/costcos-motor-oil-price-jumped-from-30-to-58-and-now-theres-a-limit-to-how-much-you-can-buy entrepreneur.com