I purchased a used 1822 with 1000 hours on it and I want to change the hydro oil. Does anybody know the process on how to do it. I did check with Grasshopper tech support and they are mailing the process to me. They did send me the specs on the oil requirements- 1. Cannot have viscosity improvers(means it IS synthetic) 2. Pour point at -50 degrees F 3. Viscosity index of 180 4. Approximately 1400 parts per million(PPM) of zinc "It is safe to use an oil that meets the above criteria. Do not use an oil that does not meet these criteria"- Grasshopper tech support Where can a person find an oil that meets the above without going through GH?