We have a 2016 Nissan Rogue SL AWD with the 2.5 liter engine. As part of the 2 year no cost maintenance plan we got with it, that includes oil changes every 5K. At 4800 miles I took it in and the manual as well as the oil cap state 0w/20 synthetic oil only. When I picked up the car, the service ticket said "drain and fill oil, filled with 5 quarts conventional 5w/30 bulk oil and replaced filter". Im a little concerned that a dealer would not follow the manufacturer recommendations when it comes to oil. Is this something I should be concerned about or let it go another 5000 miles and have the 0w20 put in next time? I already had a lengthy discussion with the dealer and they refuse to drain the 5w30 and replace with the proper oil.