Looking good on a dipstick is too often used on forums. Only thing I look for on a dipstick is oil level. Secondary, the stick's deposits, sludge, varnish, crud, or rust are easy enough to spot.
Both my cars had an oil change this past weekend. The 'thin' oil layer on the dipstick was amber cleaner(neither are diesels). But, the oil in the jar looked like black ink. So, every time someone says how clean/amber/clear their oil is on the dipstick whatever miles, I can only laugh.
As I have already recommended, time or mileage. Stick with a yearly interval and check your oil often enough never to worry about it. Keep it full. And, if there is room, I'd even consider stepping up a filter size. I'm guessing that Nissanfiniti are still using the 6607 sized peanut filter. Pretty sure many can use the 7317. If vehicle sits for many days, listen for the cold start rattle, if any, and let your ears determine if the filter that you are using is good enough, or the oil, or the combo. Many filters will drain empty over a few days. Problem with car interiors is that they are well insulated from NVH and most couldn't hear a rod about to go thru the block.
Had a situation where the neighbor changed his oil/filter with whatever combo was on sale at the local autopart. Since that change, every morning I heard that startup clatter echoing out of his garage. I yelled to check the oil. He came over and said he did a change few days earlier and now noticed the clatter, and was going to ask me about it over the next weekend. Told him to get a new filter ASAP. Swapped that evening, topped off, and all was well. Failing ADBV valve, or BPV, is easy enough to hear during the 1st cold start rattle of the day, especially if vehicle sat for a few days. Act on your hearing.
Some shops are taken their ethics, morals, reputation, or environmentalism to an extreme.... If a shop won't change your oil because of the low miles, tell them that a yearly requirement is needed for the 'phone scam extended warranty'. If they still refuse, tell them that you idle, with the AC on, 100's of hours every month, reading the daily newspaper at the park. Not sure what is going on with techs/shops nowadays, but do what a customer asks and be informative concerning it. Better to say, its is NOT needed for the mileage, but can be changed out by TIME, whether calendar or idle hours too, and we'd be happy to take care of that for you... obviously, there were too busy to care about their customer.