AC - you're right - he has a lot warmer ground temp and with the high water table he may not have to go so deep.
Memphis - after thinking about the lube flow it does seem like a potential problem. The oil has to fight gravity up 30 ft or more of tube so you wind up with a lot of oil hanging on the return and if you go with a narrow tube to increase flow rate you eat it in head loss.
There are guys here tho who know lots about oil flow and maybe they will chime in to help.
Theres also the possibility of a horizontal loop?
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