Bryan is saying that if you have the cooler installed with the in/out ports UP, then the oil in the cooler will stay there during oil changes. If you take it to the dealership and they do a routine oil change (take out drain plug, change filter), the oil cooler will remain full and they will change your oil using the usual amount for a stock 370Z (~5qts). They'd never really even know you had the cooler there.
If you instead install the cooler with the fittings DOWN, the oil will likely drain out when you pull the filter and drain plug. Each change will then require the additional quart (or so) of oil. The dealer should be made aware of this as they could potentially underfill your oil.
I doubt you'd be able to convince them to do extra work to drain your oil cooler every time you go for an oil change.
Does it matter if the cooler gets drained between oil changes if you install it fittings up? Probably not, but I'm anal about this stuff and have mine installed down.
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2013 Cadillac V-Wagon, RIP Z
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