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Costco only now was deemed to be a major oil company, based on their sales.
Until now, there were zero detergents and no additives. Just the cheapest gas available.
But since their volume makes them an oil company, they must fire in the additives, at least in California. But, rather than buying it already mixed into the gas, they are mixing it on site at each Costco store.
Would I buy Costco gas?
Not if there was any other gas available. Especially if you have a nice car.
Gas is NOT THE SAME, across brands.
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