![Is Costco's Kirkland Motor Oil Safe for Your Car? Let's find out! SuperTech Synthetic vs Kirkland - YouTube Is Costco's Kirkland Motor Oil Safe for Your Car? Let's find out! SuperTech Synthetic vs Kirkland - YouTube](https://i.ytimg.com/vi/l9il_piyuT8/sddefault.jpg)
Is Costco's Kirkland Motor Oil Safe for Your Car? Let's find out! SuperTech Synthetic vs Kirkland - YouTube
![Anybody running the Kirkland Signature Full Synthetic 5W-30 Engine Oil? Thinking about using this in my 2011 STI. Hard to beat the price and it's got all the API and dexOS certifications. Anybody running the Kirkland Signature Full Synthetic 5W-30 Engine Oil? Thinking about using this in my 2011 STI. Hard to beat the price and it's got all the API and dexOS certifications.](https://i.redd.it/2yypd88wnug81.jpg)
Anybody running the Kirkland Signature Full Synthetic 5W-30 Engine Oil? Thinking about using this in my 2011 STI. Hard to beat the price and it's got all the API and dexOS certifications.
![Test Results – Kirkland Signature Full Synthetic, and RacePro Synthetic Blend | The Petroleum Quality Institute of America Test Results – Kirkland Signature Full Synthetic, and RacePro Synthetic Blend | The Petroleum Quality Institute of America](https://i0.wp.com/pqia.org/wp-content/uploads/2021/03/kirkland-and-racepro-2172021.jpg?fit=598%2C390&ssl=1)
Test Results – Kirkland Signature Full Synthetic, and RacePro Synthetic Blend | The Petroleum Quality Institute of America
![Sound Auction Service - Auction: 12/02/21 Calderwood & Others Online Auction ITEM: 6 Quarts Kirkland SAE 5W-30 Motor Oil Sound Auction Service - Auction: 12/02/21 Calderwood & Others Online Auction ITEM: 6 Quarts Kirkland SAE 5W-30 Motor Oil](https://d2250799znyjyn.cloudfront.net/user_images2/171683_8257929.jpg)