Low mileage. stop and go traffic for the most part.it depends. you can acquire low mileage by sitting in traffic a lot. taking off from a stop is very hard on diffs. I had a customer with an early diff failure, that truck almost never came out of 1st gear as it was used for green upkeep along the roads (truck was owned by the city). severe service could've helped....
I see alot of Youtube Mechanics frown upon that idea, it seems that most vehicles with a annual oil change seem to burn oil as they get older. The 6 months even on quality oil seems to be the optimum standard.I go strictly by mileage not time on my infrequently used vehicles.