Is Costco's Kirkland Motor Oil Safe for Your Car? Let's find out! SuperTech Synthetic vs Kirkland

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At a bargain price of $12.50 for 5 quarts, can you trust Costco’s Kirkland Signature Full Synthetic Motor Oil? Costco’s Kirkland Signature compared to Walmart SuperTech’s 5W-30 full synthetic motor oil for film strength, evaporative loss, cold temperature performance, and new and used oil chemistry, including anti-wear additives, detergents and dispersants, viscosity, and TBN.

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