I did a used oil analysis of both Liqui-Moly MolyGen 5w40 and Castrol 0w40 in my car, and the results were very similar. I'd consider it a good oil. I used Castrol 0w40 for quite a while but the Liqui-Moly just ends up being cheaper with the FCP lifetime oil change thing.
My local walmart doesn't even stock the Pennzoil. Last time I checked they had like 2 or 3 of the 1 quart bottles left. Valvoline Euro 5w40 is way easier to get for some reason. I think any LL-01 oil will be fine, or even anything with the Porsche A40 spec.
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"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
-Dr. Ian Malcolm, Jurassic Park
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