As long as it passes emissions, (if required) starts easily, it's not smoking, leaking, missing, fouling plugs, lighting the Check Engine Light, and generating rated power, . . . . . . keep driving it. Add oil when it gets below the "ADD" line on the dipstick. Don't worry about it. Enjoy life and have a good trip.
You can tear the engine down and replace the seals, rings, bearings, etc. spending thousands to save $3.00 every 1,000 miles, if you prefer, but it will take the life of the motorhome to recoup your investment in a rebuilt engine. (that is otherwise operating fine except that it uses a little oil) IMO, some things are best left alone and tolerated.
Chum lee