Costco's Kirkland Motor Oil is available at the warehouse store and on the Costco website, where a two pack of 5 quart bottles of Kirkland Signature Full Synthetic Motor Oil will run you about $36 ...

Costco’s biggest appeal is its competitively-priced, private label brand Kirkland Signature. These items are not only high ...

Shopping at Costco already feels like a smart money move, but switching to Kirkland Signature products can stretch your ...