The west marine oil I looked at in the store was tcw3. I called an OMC factory trained mechanic I know in NY this afternoon. He said use the evinrude product. He admitted that the other "probably" won't do any harm and in a pinch it would be fine to make do, but told me to buy a load when its on sale and be done with it.
I need to swing by the dealer and bulk up.
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