We used to change engine oil for Nissan 1.8D after 2000~2500kms in city driving.
It was some 10~15 years back when diesel was much cheaper than petrol.
I am also willing to buy a diesel car but I'm confused after reading your comment about breaks. Actually I am a Honda user from years but some of my friends asking me to buy 2.od of 2009-2012 . Would you like to guide me please