What are the advantages of running synthetic gear lube vs dino gear lube? Our truck has about 160k on it now, we bought it used with 80k on it and I changed both diffs at 100k with dino 80w90 Gl5, I am thinking of changing them again but the synthetic is so expensive however I off road a lot and tow a lot with this vehicle and I really would like to avoid changing diff fluids every 80k so would switching to a synthetic allow me to extend my change intervals? Is there any other benefits to using syn? It went 80k on dino twice and shows no sign of failure so I am wondering if I should just stick with the cheapest dino I can find and change it again in a few years?
Last edited: