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I used to shake the one-quart cans.....back in the 1960's. It was all straight grade motor oil, and 90% of that was 30wt. If you didn't shake the can, you could see the remains of what I assume was an early additive package in the bottom couple of tablespoons from the bottom of the can. It used to look like very fine coffee grounds, but very "mushy." Of course, back then every engine had a thick coating of sludgy guck on everything. That's why you drained the oil hot and shook the new can before you poured it in. Back in the day retail motor oil was pretty much the way it came out of the ground.
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