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Marketing is a powerful tool!

Your old carbureted Evinrudes don't have much in common with the post-2001? BRP/bombardier owned evinrudes.
Sure the etecs and similar injected 2-strokes with tighter tolerances may benefit from the oils designed for that technology, but a relatively inefficient gas/oil burner like a 1998 v-6 was made in the time when tcw3 standardization was implemented.
https://www.nmma.org/certification/oi.../oil/tc-w3 (Link help?)

Whose to know if the older carbys may like a less refined oil similar to when the designs were new?
Oil choice will always be an arguing point, but wasting money unnecessarily may be for your peace of mind not the engines!

TP (25+yr boat/auto mechanic ;) )

(changed abbreviated year to full 4 digit year per guideline #1 at the top of this page)