My lines are all -10 (greddy sandwich plate with built in thermostat, setrab 10 row oil cooler) and if you think about it the flow pattern is the same whether you have it mounted upright or upside down, the oil has to travel down than back up or up and than back down so i don't think it should matter plus air should automatically be bled as soon as your engine starts to warm up or at least with a little driving around.
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