If Nissan is installing it and guaranteeing your warranty, you're fine.
As for an oil change, it will make no difference in terms of car care and engine longevity if you empty the cooler as well or not. If you choose to empty the cooler, you just unscrew one of the cooler hoses at the sandwich adapter by the oil filter during your oil change. If you do that, you'll add the extra quart when you replace the oil. If you don't unscrew a hose (empty the cooler), you'll just add the 5 quarts. Make sure you measure using the dipstick as '5' and '6' are ballparks.
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2013 Cadillac V-Wagon, RIP Z
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