Does anyone remember these?

When I started in the oil business we were still selling the paper cans. At Pennzoil we'd just transitioned to the 12 pack. Market research showed women bought a lot of oil, but wouldn't buy 24 quarts because the case was too heavy (50 pounds). In those days Arnie Palmer was in a lot of the advertising.
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And now they're down to six quarts in a "case". My NAPA guy says that due to the cost of oil, consumers are reluctant to buy more than they need for one oil change, so...., six quarts.