I completed the 50 hour maintenance on my GC2610 today. Switched all fluids to Amsoil synthetic and it runs better than the day the dealer delivered it. The Amsoil ATH synthetic in the transmission seems to perform very well. I used NAPA filters on the oil (1360) and hydraulics (7089) versus paying extra for the same at the dealer. I will reply back with details on how the ATH works in the hydraulics during the winter months. I am sure the synthetic gear oil will be better for the front axle than the mineral that oozed out of it.