Not that I don't completely trust you guys, but I contacted Setrab directly, by phone (since nobody seems to respond to emails).
They confirmed that oil flow is the same as both of the sandwich plates described above.
Setrab pointed out that the Series 1 34 row cooler holds 0.43 quarts of oil so no matter which way the oil goes in, there is enough oil flow so wouldn't be any air pockets anyway.
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