Hi guys, as you can see I am new here and trying to learn all the ins and outs about oil. Hoping some of you seasoned veterans can put me on the right path 
I recently did a oil change with Pennzoil Ultra and I am very impressed with how much better the car runs. I know that it is a GF-5 oil and was wondering if any other oil manufactures are making GF-5 oils yet that I could compare Ultra to, or if Ultra is currently the only one.
Also, a friend of mine told me that Mobil 1 was better than Ultra based on the fact that Ultra uses a group 3 base. I can't seem to wrap my head around his reasoning. Does anyone think he is right?

I recently did a oil change with Pennzoil Ultra and I am very impressed with how much better the car runs. I know that it is a GF-5 oil and was wondering if any other oil manufactures are making GF-5 oils yet that I could compare Ultra to, or if Ultra is currently the only one.
Also, a friend of mine told me that Mobil 1 was better than Ultra based on the fact that Ultra uses a group 3 base. I can't seem to wrap my head around his reasoning. Does anyone think he is right?