On 1/8/06 3:47 PM, in article Xns9745AB0BBA8A6tegger@207.14.113.17,
"TeGGeR®" <tegger@tegger.c0m> wrote:

> "TeGGeR®" <tegger@tegger.c0m> wrote in
> news:Xns9745A9998379Dtegger@207.14.113.17:
>
>> "Elle" <honda.lioness@earthlink.net> wrote in
>> news:8xbwf.4628$%W1.1753@newsread2.news.atl.earthl ink.net:
>
>>>
>>> If Honda thought 10W-30 or -40 today is dangerous to the
>>> transmission, I think they would have said something.
>>
>>
>>
>> They have.
>>
>> An example from the '02 RS-X manual (pg 13-4):
>> "Always use Honda Manual Transmission Fluid (MTF). Using motor oil can
>> cause stiffer shifting because it does not contain the correct
>> additives."
>>
>>
>>
>
>
>
> Just checked the '96-'00 Civic Helm manual. It contains the same warning,
> word for word.

Go back another decade to the generation the OP has and check again. We had
an '81 and an '87 and the recommended manual trans fluid was 10w-30 motor
oil. There was also a caveat to not use synthetic because the synchros
wouldn't work correctly with it.