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Read articles →This is a hands-on, step-by-step walkthrough of draining and refilling the BX23S front axle/diff fluid, done early at roughly 275 hours ahead of the 400-hour service interval. It covers tools needed (14mm socket, screwdriver, drain pans), fluid choice (Super UDT vs. 80-90 gear oil), the 3.8 quart fill amount, using compressed air to speed draining, and checking level after a 10-minute settling period. Best for owners doing this service themselves.
Posted by the Tyler Koehn channel, an owner sharing a real maintenance job on his own BX23S.
It takes three point eight quarts of fluid to fill the front diff.
You can use Super UDT, the same fluid used in the hydraulics, or 80-90 weight gear oil, which is specced in the manual.
You'll probably need a 14 millimeter socket, maybe a screwdriver, a grab device for the fill plug, a funnel, and drain pans.
Let it sit for ten minutes after filling so the fluid can settle into the lower units before checking the level.
