I use Mobil1 0-w40 and change at 9000kms with original oil filter bought from 3s dealer. Mostly if you use oil for extended period no matter which car the oil level drops a little but in my case it does not happen and when changed the old was in ok condition.
This is just old thinking and outdated now, if you go and search topics few years back people used to change their synthetic oils and proudly tell "ma to 2500 par change karta hoe" and actually mocked those who changed it around 5k kms.
I have used 20-w40 Mineral oil in my xli from day one and changed it at 5000kms and still do the same.. now car is Driven 210,000.
Since it has been 17 months and 6ooo kms you should change oil.