Perhaps I have some related info. Out here in the wilds of montana we occasionally have bevel gears(or diffs on the ATVs) that will spew a bit of oil out the breather. I have also had it happen on shaft drive sidecar rigs. Makes a mess but doesn't seem to lower the gear oil level much. I can usally trace it to cold rides with the gear oil being thick and forced out the breather a bit. It only takes 1/2 teaspoon of gear oil to make a mess. The ATVs have a breather hose about a meter long and the cold oil is forced all the way out the small diameter hose. I still wish I hadn't sold my R26.
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