In Reply to: Re: hydraulic fluid or Gear oil posted by Tim Daley(MI) on May 09, 2017 at 13:28:14:
Nice dissertation on gear oil as specified for the N tractors. Gl-1 was not the original gear oil for Ford N's. However starting in about 1941 until about 1947 SMO 90w was a specified gear oil and for a time 50w motor oil was also a specified for gear lube. The only reason for the temporary straying from the original spec was severe shortages to downright unavailability of mild EP 90w due WWII. Most everything was rationed including the food on our tables. Farming was tough, blow a tire and you need to scratch for a usable Junker, planting corn, what no fertilizer, need tractor gas OK you can order some, up to 50 gallons if they had any, not any more and don't get caught hoarding gas if you want to be able to buy more. I feel that when people read the old manuals they do not have a clue as to what life during WWII was like. Also if they are reading a war time manual they don't know that the specs in that particular manual were temporary. Right on the marketing hype perpetuates the GL-1 myth and folks do tend to believe anything they see on the net or read on labels.