I have the square tank seen in the upper right of the picture.
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On the right side, toward the front of the tank is a glass view tube. It tells you the level of oil in the tank and would show if there are layers of other things like water in there. I am headed to the coach and will try to get a picture of that.
Checking that view tube has become a part of my standard checking. I want to make sure that the confidence I think I have because of carrying additional oil is justified. I never thought about it as getting contaminated before.
Here is the condition of the resevoir tank cap when I took possession of the coach and the reason I started always checking this. It does have a breather hole in the center of the cap.
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