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dnewton3 asked what the chassis manufacturer (Freightliner) requires. I skipped that step when I saw that a few different rear axles with different capacities are used in the XC chassis. I identified my axle and went to the Meritor specs. Meritor calls for GL-5 & J2360, which appears to be a mil...

I ordered a case of Mobil 1 75w-140 GL-5 gear oil for use in the rear axle of our '04 diesel pusher (Freightliner XC chassis) motorhome. The mechanic filled the diff before noticing that the oil is labeled Light Truck & SUV. The Amazon listing did not have that info, unless you enlarge the photo...