I've been running Pennzoil Conventional 5w20 in my Scion XB and have been very happy with it, seems to run a little smoother and the valvetrain is a little quieter than it was with Valvoline NextGen. I do about a 50/50 mix of driving and change the oil every 5,000miles which comes out to an oil change about every 3 months. Anyways, I'm considering running Chevron Supreme 5w30 in it since I can get it by the case much cheaper at work and from my research, the 2AZFE in my car calls for 10w30 everywhere else in the world. I'm having a hard time deciding which way to go as both are excellent conventional oils from what i've seen and the chevron is cheaper for me, but like I said, I've been very happy with the Pennzoil Conventional and it seems like everyone that uses it loves it as well. Which one would you guys pick?