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Yes, the marks do indicate the proper operating levels. The lower mark near the bottom of the reservoir is your fluid level when cold, the upper mark near the middle of the reservoir is your fluid level when the unit is hot.
These units are normally good for up to 1000 hours of use without service. You can changed the fluid if you would like but you have to find a way to drain the unit as there is no drain plug on them. You can tip it upside down and drain through the reservoir but it will take some time for all the fluid to drain out.