Thanks for the link. Correct me if I'm wrong but if the lines are routed upward, and are just slightly above the cooler, then the oil cooler can not drain back into the engine? Actually the inlet line from the highest point down to the engine could drain back, so that is a single hose maybe 50" long. Pretty negligible and the top mounted fitting has the same issue.
Push comes to shove I'll top mount, but I really would like to change the oil in the cooler. I intend on doing UOA's so removing as much oil as possible is important to me.
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