Differential lube

I think my manual says 100,000 miles.

Check the level when you buy it. Check it again after about a month. Change it at about 100,000

Check your owners manual under Maintenance Schedules!

If you just have to change it- go synethic and then forget about it.

sjholt wrote:
If you just have to change it- go synethic and then forget about it.

Yup. Costs a lot more but good for the life of the coach.

The post about synethic confuses me. Since there is nothing to cause the oil to break down as there is in the engine, I would think the only reason to change it would be shavings. Synethic wouldn't help with that.

I've owned a lot of vehicles for a lot of years and have never changed the diff fluid. I just ensure it's topped off if I notice a leak.

For motorhomes, Meritor Technical info shows change oil at 1 year or 50,000 miles for dino oil or Synthetic oil at a 3year interval - 250,000 miles... It also lists the approved oils, and some favorite brands are not included..
Meritor Rear Axle Lubrication

When I buy a used vehicle, truck, car, motorcycle or MH, I change all fluids. When I bought the 2005 MH about two years ago I changed all of the fluids - antifreeze, leveler hydraulic oil, front hub oil, rear end and engine oils to include those in the generator. I like to know what's in there and that it's good. I'll probably never change the rear end oil again. The filters and belts got changed also.

Bill

Changed mine at 50K for gas Ford RV's. It was horrible looking, which doesn't mean much but I'm glad I changed it anyway.

Pressure and shear, between the gears and bearing will wear out oil. Most have a lot, of sulfur, as a anti wear agent.
We had ours changed. last year, I think. It was dirty. I had started noticing, a little noise, from the differential.
It was at about 25,000 miles.