Bump for any answers... .
Standard told me to use Pennzoil as far back as late 2005 or early 2006 when they overhauled the NV-5600 in my old '01. They've been telling customers for years to use Pennzoil and an overfill as long as I have been hearing about Standard in Fort Worth.
Edit: Reading back over this thread I now realize the original question was about the G-56 not the NV-5600. I have never owned (or wanted) a G-56 and don't know much about them.
Disregard my comments. But, Standard does know what they are talking about. I would follow their recommendation if I owned a G-56.
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