Those shopping at Costco may have encountered the chain’s exclusive Kirkland Signature Synthetic Motor Oil and wondered how it compares to some of the best motor oil brands. While the brand is ...

Costco Kirkland products range from food products — like maple syrup, lasagne and coffee — to consumer goods, with many ...

This includes similarly economical motor oil brands such as Amazon Basics Motor Oil and Costco's Kirkland Signature Motor Oil ...