Oil Changes in a 4 stroke generator - if not used

About time, I was looking for ages for the manual a few years ago and nowhere to be found on planet earth. Thanks heaps.

Sorry, very wrong. Having trained in Oil Analysis as a Mobile Fleet Maintenance Planner in Mining and being a Diesel Fitter by trade I can tell you oil does lose it's properties with this amount of time. If you want your gear to last, change it. Why quibble over a very small cost for an expensive item to replace. People have mowers that go for years without changing ( others, not me ) but that does not mean it is the correct way to go. Oil picks up moisture and begins to break down even in the sump of the generator not used. If you want proof, get an Oil Analysis kit from CAT or Komatsu and send it in. Don't bother with those ridiculous self test kits people try to flog - and there is a correct way to get your sample. You can get many blokes testing the same oil for different results if the correct, clean procedures are not followed. A kit from CAT or Komatsu will give you plenty of forewarning of which components are wearing by the type of metals present and any dirt/moisture/coolant ( if applicable ) ingress and if any fueling/air problems are present. I would not bother testing my small 2kV Honda Generator but this advise is for vehicles or anything expensive thats mechanical. Even the driveline components can be tested to give you trends and a lot of forewarning of a failure. Oils aint Oils Sol !