ATF, JASO rated engine oil, Honda two stroke transmission oil, Hypoid 90w140 differential lube, 30w Diesel grade oil, Harley full synthetic transmission oil, Harley Sportster primary/transmission oil, Primary chaincase oil, 140w industrial gear reduction transmission oil, outboard motor lower end oil and a slew of others are all safe. You may lose AWD function with some, but all are safe and many are superior to the recommended AGL, but what do you expect to gain and at what cost?