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It is 20 and 10, but to make it quick and easy, I use 15 thou top and bottom, and it works well.

Check your axle vents. You will build pressure and push fluids out every time you drive if the vents aren't working. I go off-road a lot, so I replaced my vents with hose barbs and tied them all together with tubing ending in the cab. That way I know when water might get into the system.