Caught the Bug
I didn't take the reservoir out and shine a light through it, but I'll do that next. My issue is when I replace the coolant thermostat I'll need to top the coolant off and I want to be sure I'm using what's in there. I'm assuming it's OAT since that's what it should've come with from the factory and I haven't noticed any issues (it either hasn't been topped off or it has been with the correct stuff). Outside of color there's no way for me to know if it had previously been flushed and incorrectly filled with HOAT, though.
Might just have to consider a full flush to be completely sure.
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I've never tried it but I wonder if you could mix some of oat that you purchase with a small sample from your reservoir to see if it reacts. Otherwise I'd probably do what you suggest to be on the safe side and do a full flush since it's realtivley easy.
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