well, i didn't notice this noise until recently, when the dealer did the first oil change and they put in 10w-30 much to my disgust. I swapped it out for 5w-30 on my own the very next day, but i did know that the cold startup noise started around that time as well...
incompetent fouls.....
btw, nissan re-imbursed me for the oil change after i hollered at corporate.... the dealer at first wouldn't budge. I spammed every exec on this continent and that worked.... I am about to call nissan up to see about getting the second oil change, if they come back with 10w-30 that's what we use, then heck with them.....