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I've never used it but if looking for a deal, Amazon has full synthetic Castrol 5w40 on sale right now for $36 for 6qt: https://smile.amazon.com/Castrol-06249-5W-40-Advanced-Synthetic/dp/B007G7PWSA/?tag=geapat-20&sa-no-redirect=1
Long time ago I worked with a guy on oil refinery who was finishing his doctorate in mechanical engineering. He basically said the difference in oil brands was negligible, if the weight and type are the same, there’s no difference.
 

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Long time ago I worked with a guy on oil refinery who was finishing his doctorate in mechanical engineering. He basically said the difference in oil brands was negligible, if the weight and type are the same, there’s no difference.
As well with gasoline. It all comes from the same "pipeline" the only difference from brand to brand is the additive pkg.
 
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