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Gearcase oils for Evinrude 4425

Is the the HiVis 80/90w Outboard gearcase lube fairly standard for low hp motors? I have a 1939 Johnson 5hp AT-39, 1968 Johnson 3hp JHL-23M, and 1975 Evinrude 6hp 6504R. Would be nice to be able to use the same stuff for all three.
 
No, not "standard" by any means. Many/most motors before 1950-ish use outboard motor gear grease, no longer made. For those, most people use Lubriplate 105 assembly lube from NAPA, or corn head grease from John Deere dalers Your 3 and 6 do use the HiVis or 80/90 oil though.
 
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