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  1. M

    Pennzoil Ultra - GF 4 or GF 5?

    When Pennzoil Ultra first came out I could have sworn it was rated as GF 5, but now the spec sheet says GF 4, what gives? Also, when Pennzoil Ultra first came out there was a thread here about it being at walmart. In that thread Pennzoil posted a link where they answered everyones questions...
  2. M

    Learning about oils from the Pros

    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...
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