i bought new mehran in jan15. its 43k driven now. used zic x9 , x7 and suzuki's own ultimate one. oil change interval is 5000 to 6000km with all time ac on. cannot afford oil change every month/2500km. so my oil change interval is long. i am usually out of city when oil change is due so i wait to reach back home and then change oil for peace of mind. but i think zic x9 is synthetic. with zic x9 engine noise reduces, silent drive and less viberation. till now engine is in good shape MashaAllah with no problem so far. silencer is clean . no oil or carbon.
in 2-3 months car will cross 50000 km . and tireschange will be due . i am thinking to sale it near 50000km. it served me well Alhamdullilah without any problem