Hello all...I'm going to be changing my oil for the first time on the Aveo and was curious to what everyone is using? I use Mobil 1 in my Trailblazer, Motorcraft Synthetic Blend in the wifes Mountaineer and was considering using only conventional oil in the Aveo? Any comments/suggestions? I use a 5000 mile OCI in the two SUVs but am wondering if I should drop my interval to 3500 or 4000 in the Aveo since it is a high revving 4 banger.