Here's why Costco Wholesale increased the price of its motor oil products.

For a warehouse retailer famous for selling items in endless bulk, imposing strict purchasing limits is a massive red flag.

Costco has raised the price of motor oil sold under its exclusive private-label brand as well as limited how much of it ...

The next-gen heavy-duty engine oil standard (PC-12) has been formally approved, announced the American Petroleum Institute, which also introduced the new CL-4 and FB-4 “donut” certification marks ...

Costco has begun limiting how much motor oil each member can buy, imposing a two-per-customer, per-week cap on its Kirkland Signature full-synthetic as prices climb alongside a shrinking global supply ...