AOA all, my vitz has done 1lac 17 thousand kms
... 2005 model, now from last few months, it has started decreasing engine oil but only after that oil has been used for 3000km, i get oil changed at 4.5k to 5k KMs.. i use caltex havoline SAE 10W30, is the engine going byebye
.. or shld i change my oil viscousity/ type (like synthetic?) or anything ?? any help plzz