Originally Posted by 13WaysToBleed
From what I understand there are many synthetic oils out there that are better than Mobil 1 for around the same price or a little higher. I'm not sure on this but I heard that Mobil 1 is only a Group III oil. While Group III is considered synthetic, only Group IV is true synthetic and is the superior oil. I think at one point Mobile 1 was a Group IV and that's how they earned their rep. Regardless, do a little research you'll find a better oil.
Here's a chart from Amsoil. Granted it is Amsoil promoting their oil so take it with a grain of salt.
I rotate between Amsoil synthetic and Castrol synthetic 5/30 weight oil. As someone mentioned in an earlier post, these synthetics are so light that they provide great performance, that being said, they also burn off more too. In older engines, it's good to check the oil periodically because in my experience light synthetics burn off...