Posted by Tom Fleming on June 03, 2010 at 18:12:40 from (206.193.253.243):
In Reply to: lawn mower oils posted by pocvalfm on June 02, 2010 at 17:37:28:
Steve, I think mkirsch said it well. If the manual reccomends that oil, then use it. The lubricity of oil and the viscosity of oil are not necessarily related. One of the reasons for gear lube being a heavier viscosity is the heat generated, and the metal to metal friction that occurs in the gears. Also, it does not have to "flow" it only has to cover the metal parts.
A "tacky" lower viscosity oil can be just as good as a lower-tack higher viscosity oil. We could discuss surface tension of the various oil blends, which will affect how much of the oil "sticks" to the gear teeth as the move through the oil sump at the bottom of the gear housing.
The best thing you can do is compare the price of a gallon of Hytran to a gallon of basic 80w90w gear lube. Pick the one that is easiest on your wallet. You won't be making a mistake which ever one is cheaper (if you are replacing the oil). If you are just topping it off, use what ever oil is already in the gear housing.
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