2001 Mazda Tribute calls for 5W-20 oil. I use Valvoline Maxlife 5W-20. However, I was in the local Advance and needed to get the filter # for the PureOne filter and the salesguy said that their computer showed that I should be using 5w30. I guess he saw the 5qts. of 5W-20 I had on the counter. What do you all think about this since even the oil cap has 5W-20 printed on it? Have the oil specs changed for this vehicle? Would 5w30 hurt?