Global Shortage Has Led to Motor Oil Rationing at Costco

Costco has introduced purchase limits on motor oil and significantly raised prices due to global supply shortages, with Kirkland Signature synthetic oil jumping from the mid-$30s to $57.99 per 10-quart case. Members are now restricted to buying two units every seven days, making DIY oil changes less economical as tightening lubricant supply and the complex production requirements for modern engine oils drive up costs. The shortage reflects upstream pressure in petroleum refining, where base oil production competes with more profitable gasoline and diesel production.