[bestgenman]

I keep a log book of every time we’re on the road.  It includes the engine hours on the generator, i.e. beginning / end.  The interval is 100 to 150 hours depending on the dirt environment.  It doesn’t matter which hourmeter you use, just use the same one each time.  The change gets logged in and written on the filter.  I’m currently ~10,000 hours and 30,000 is not unrealistic if proper maintenance has been adhered to.  I check the generator prior to each trip which has saved many headaches.  Hoses,belts, leaks, loose parts, rubbing/wear points, & fluids all get checked.

Steve’s plan with synthetic is also a good plan, especially the mid interval sample.

My 2 cents worth.