Does Mercury Optimax Synthetic Blend 2 Stroke oil go bad or have a shelf life?
I had less the a quart in the reserve tank and went to add some when I noticed the oil In the reserve tank looked like it was separating. You could see visible bands of different colors as if the various synthetic blends have separated. Is that normal?
2019 Mercury Optimax 200 Pro XS
I've never experienced it. Are you asking about the remote tank (in boat) or engine reservoir? If remote, my advice is to remove, drain, and clean tank before refilling. I'd also check the pickup strainer to make sure it's clean too. Try to keep the level no less than 30% and no more than 80% full at all times.
Based on the label, it has not exceeded it's shelf life. That being said- colors will vary from one batch to another, so it's possible you were seeing that, OR also possible that you have some moisture in the remote tank (which will make for some unusual swirling-shapes in the oil if you're adding to a tank that's quite LOW).
I would be investigating this by removing the tank and the contents to determine if there is ANY moisture present.
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