I change oil once per year in my low annual mileage rides - Motorhome, jeep, old truck, lawn tractor, etc. Do it in my birthday month so easy to remember when due.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.