Costco sells house-brand motor oil under the Kirkland Signature label it uses for many other products. Does this oil pass the same tests other motor oils do?

Costco makes that easy to do, too, without making you feel like you’re paying luxury prices. For just $69.99, you can take home a four pack of 5-quart Kirkland Signature 5w20 synthetic motor oil.

There's a visible theme in this month's recommended Kirkland Signature groceries to buy at Costco. Not only can members save money with these competitive prices, but they'll have well-stocked ...

Costco's Kirkland Signature brand is a cult favorite, and it offers a lot of organic products at reasonable prices. But is the entire line of goods organic?