The really interesting part of that helpful info is that it only became a 'recommended' thing to do AFTER Cummins bought them.
Maybe Cummins have different product liability lawyers than Onan did?
A friend of mine has a cottage on an island in the Great Lakes, his 'power supply' is an Onan 4KY series genset that came out of an old scrapped RV. It runs weekends only, except for 2 weeks vacation in August, every year from about May to October. It then gets run dry and sits idle, locked in a tin shed on a he shore of that island until the following spring. It's done that for way more than 20 years now. No monthly exercise for 6 months of nasty weather a year. No issues, no failures.
So much for 'recommendations'.
Ted 'n' Laurie, plus Jackson (aka Deputy Dog, the Parson Russell Terrier 'fur kid') and, Rylie (who crossed the Rainbow Bridge June 14, 2012).