I didn't do my cooler install but mine is facing down. I've always heard this wasn't the preferred orientation because it could hold air. Mine does seem to working well however.
I'm not convinced of the backflow theory since the oil gets sucked from the pan, into the oil pump, through the oil filter, and then through the oil cooler and then through the oil passages in the engine. Most filters have anti drain back valves built into them so it probably couldn't go that way. So that leaves the passages, which go throughout the motor that it could, backflow through. I guess if any of those passages are below the oil cooler it could backflow through them.
I wonder if the difference in what modshack saw and what the spearfish saw was the difference between having a filter with a good anti drain back and one without.
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