Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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You could move to a different oil which might help but understand that the last number on your oil viscosity is the consistency that it takes on when it gets warm or hot. In your case my normal recommendation is that you run 15W50 synthetic motor oil in the transmission. Notice that it is still 50 so I am not sure that it will help your problem. It is odd that this transmission only has about six months or use and is giving you trouble again. Can you tell me if there is a filter on this transmission or in the hydro system? Had it been working okay when you first installed it and just now started giving you problems?