Re: Super Tech Gear Lube Oil
If it were me, I'd only use what the mfg. specifies- most likely marine grade lower unit lube. I'm not sure how compatible standard (non marine) gear lube is with water. Marine grade lube, as I understand, can tolerate a certain amount of water intrusion, where the plain stuff may not.
The brand itself I'd be fine with- but why not use specific lower unit lube?
There really isn't any compelling reason, in my opinion, not to use something that meets that specified standard. I figure they know way more about it than I do.