Hi, I still haven't been able to get the lights to work, my headlight switch will not turn them on.Not a big deal just won't use them until I come across someone at a RV meet that has the same couch.As to the oil change I've only had 1 service done at Cummins in Fresno Ca. just before my first trip, I bought this rig from a dealer and had everything serviced before a trip to Rocky Point Mexico 2 years ago.Total miles I've put on it since buying it is about 4k had some medical issues and have not used it since last July 4th weekend, but the oil still looks good.Have used maybe 3 qts of oil total wait till the low mark and add 1 gallon.The red switch next to the mirror switch is for heated mirrors, never have used mine, not sure if it works.
Hope this helps out, my rig only had 57k when I bought it.
Best of luck with yours
Ramblinpete.