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This is a screen shot from my computer. The window in the middle is from my owner instructional DVD I received with my 2010 GS.

Although it may not be crystal clear, it shows a quart of the Mobil 1 5W30 Extended Performance oil sitting on the engine.

I understand everything being said/discussed, but this is my evidence if anyone at GM questions why I have been using this oil in my LS3.

Personally would consider the printed information in the manual to be of a better reliance, thereby dismissing any controversies that may arise regarding engine related concerns.

However a picture may serve, a manual is still considered a more reliable and proper resource for information, imo.
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