Salam everyone, i recently bought a toyota vitz 2012 model (3rd gen). It has 1kr engine and 98000 mileage. I wanted to change engine oil and found out that previous owner has used shell 20w50. My mechanic suggested to put toyota petronas 10w30. Should i keep using 10w30 or move to some other grade as many people recommended to put 5w30 in it.
