when i bought the car i start using total as previous owner was using it , than i start using caltex 20w50 as most of my friend recommend me caltex , total and caltex both were ok , caltex i find better as engine noise was less in caltex although total gave me good result aswell , than i switch to Zic A as our dear friend mr Umair recommend me Zic all the way and surprisingly i only pour 3 litre pack of zic and it shows me nearly half way mark on dispstick and result were really amazing , so i stick to zic for future reference , although as kamran suggested many of my friends using shell oil and they are utterly satisfied with the result , as for changing oil is concern i feel any oil would do good for 3k marks , it would be safe to change in btw 2.5 to 3k but people like me who hardly drive i change it once in a year which is nearly 2k kms in 1 year 
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