Ive been searching for a recommended trans OCI for my toyota and in my owners manual and maintenance schedule both dont mention anything transmission fluid related. Would anyone happen to have this information?
Auto or manual? Can't help you other than give my experience/opinion.
if Auto it depends on whether you want to do a complete fluid replacement or just drain and fill. Complete I'd say 60,000 miles on based sever service. If drain and fill I'd say 20,000 to 30,000 miles should be OK.
If manual I'd go 20,000 to 30,000 then replace with good quality synthetic and leave it be for just about forever.
There probably isn't any, and in a fairly mild climate you can probably get away with just leaving it forever. Any improvement from changing would come in the form of shift feel, primarily cold weather.