Hi All! Glad to be here! My manual and oil filler cap states use 5W-20 or 0W-20, the manual states to change it every 8000kms or 3mos, whichever comes first. For those who dont know a Vibe is basically a Matrix and so is not equipped with an Engine Oil Life System like on other GM vehicles. I recently brought my car into a GM dealership for the service/inspection required by warranty and found out later that 5W-30 was used, The car currently has 7000kms on it and will take it in for another oil changeout in 3mos.