Honda never used gear oil in their transmissions, maybe in the rear ends on the Wagovan? but it's always been motor oil up to the point that they switched to their own MTF, even Amsoil MTF is no longer even recommended as it can be to thin and not provide the needed protection, their site even recommends their motor oil, I've put it in all 5 of the Civics that I've owned including my CRX tranny, my Civic FE tranny and both my Civic vx transmissions, of course I used 0W30 in mine as we get rather cold winters here, changing the tranny oil makes shifting much much smoother as the oil that came out of all 5 of the Honda's I've owned looked like it had been in there a long time.
The site that hosts the 800 page or so PDF file of the dealer shop manual for the early Civic and CRX's is currently down, as soon as it's up I'll get the exact link for that manual.
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