How often do you guys flush your differential gear oil?

[fkloster]

every 2 years? 3 years?

[Gary RVRoamer]

As I recall, my chassis manual says every 24 months. Mine was changed after 3 years. It's been another 3.5 years, but I'm thinking of doing it again this winter. I have synthetic fluid in it.

[RV Wizard]

I also use synthetic and I think with the average mileage an RV does; every 3-5 years would be OK on changing the rear end lube.

[Rocky Larson]

I believe mine doesn't time out, but is wear dated at 100,000 miles. I changed it out anyway at 5 years and 40,000miles. You can pull the fill plug at anytime to check its magnet for self destruct particles. Anything more than a little fine dust would be suspect.

[Spikester]

Did mine after the first year, then will do 2 years later, at this time will change to synthetic. Manufactures suggests 15K miles or annually, whichever occurs first.

Spike