4000 km....kabhee kabhee 4500 km too. it works perfectly fine. u ask any mechanic, they wud tell u to change it after 1200 km. DONT LISTEN TO THEM. woh saray lutairay bethay hein. and DO change the tyres if they are general. use bridgestone or dunlop ones. u will see a MARKED changed in drive and braking. if u sell the stock ones straighaway within 100 km on the car, u can get a GOOD money outta it. i went to market with ma cultus with general 155 tyres after using it for 10 thousand kilometers, and the guy was willing to pay 4500 to me straightaway
i cud have convinced him for more. so u can sell YOURS for abt 6000, and then only pay 3000 more to get brand new ones