Thread: Costco oil
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Old 06-11-2022, 10:54 AM   #6
mvweebles
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Quote:
Originally Posted by koliver View Post
I bought Costco Synthetic oil for my cars (not diesel).
After a close reading of the label I decided against using it in my diesels as it doesn't disclose meeting all of the diesel requirements.
Blending of oil for API specifications is a highly controlled science that is constantly improving. If an oil is rated as Combustion (C), it will definitely say so. If it isn't rated "C", don't use it in a diesel unless an emergency. Costco or otherwise.

Peter
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