Below is an email sent to Amsoil and their reply concerning a fluid for the 5-speed.
Currently my dealer says that an Amsoil lubricant for the manual transmission on my 2000 Honda Insight is not available. Will you have anything in the future? I use Series 2000 0W30 in the engine with favorable efficiency results (Honda recommended 0W20) and would like to use Amsoil in the trans as well. Thank you,
From: AMSOIL Technical Services
Thank you for contacting AMSOIL with your concerns.
In response to your inquiry, yes the driveline fluids folks are looking at a manual transmission lube for Honda/Acura vehicles. We don’t have a time line yet though.
Thank you again for the opportunity to respond to your concerns. As always, please feel free to contact us again if we can be of further assistance.
AMSOIL Technical Services