I don't own a Mercruiser so haven't ever bought it, but don't rule out buying the Mercury Quicksilver oil they recommend. I don't know the price, obviously can get it at a boat dealer but I think also at Walmart and maybe some auto parts stores.
Out of curiosity I took a look at Mercury's oil site, they say it's a 25-40 synthetic blend. So there you go, maybe Mercury broke their own rules on the full synthetic recommendation, not sure. Interesting.
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