I recently acquired a 2000 Honda Civic. I retired my old 91 civic from daily driving duties to only weekend trips and such. That transmission had well over 300+k miles on it however, I think those miles had more highway miles than what my car has. The 91 gearbox still shifts great however, I do get some resistance here and there and the 4th gear syncro kind of scrapes. My transmission I feel like it had a lot of city driving in its past life and my daily commute for 6 or 7 months out of the year is mostly town/city. I do not abuse the transmission and rarely take the engine above 3-4k. However, when I do, especially in 1st gear, I notice heavy syncro resistance going into 2nd gear. So I'm not 100% sure on the health of the 2nd gear syncro.. Is there any tips on prolonging the transmission life? I just recently changed the fluid for Genuine Honda MTF on my last oil change. Should I follow the maintenance guide and change it when they say (20-30k if I remember correctly) or do it sooner? Thanks for advice!