is it ok to use synthetic atf in a honda?
Not according to Honda.
What year honda??
Newer honda’s require Honda ATF ONLY. Older ones (before late 90’s) say to use Honda ATF OR Dexron III equivalent.
Did you look in the Owners Manual. It will spell it out EXACTLY what ATF you can use.
I’m using synthetic ATF in my Acura and it works great! I’ll not go back to ATF-Z1.