Cummins 5 year old synthetic oil with 1000 miles - change ?

My oil is going on 5 years and last year I only put on about 350 miles. Blackstone labs says to keep going as the oil is good and I am running Dino, not Syn. I would not worry about it especially for the short haul though I would put enough miles on it during the moves to get the engine and oil hot, maybe a 30-45 minute drive on the highway and not city streets.