Temp, getting the oil capacity spec is a great advice to verify proper oil level. You never know when a previous owner replaces an original dip stick with any dipstick that might fit. In 30+ years, anything and everything can happen with these machines.
Also, I agree on the Onan reading high when you first pull out the dipstick even if the engine hasn’t been run in a week. Always have to wipe it and drop it in again to get the proper reading.
