Out of curiosity I looked at the gear case lube for my Yamaha and it's 80w90. Can't see a whole lot of difference between 80w90 and 85w90.
You are right on the Quicksilver/Mercury stuff the "high performance" stuff is designated for 75 horsepower and above. It's my understanding that product is very well thought of because it is very good at protecting the gear case if water enters. That's the biggest difference between the automotive stuff and the marine stuff. If it were me I would use the marine stuff and specifically the high performance stuff in the absence of using the factory stuff.
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