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Why is Mobil 1, and Not Mobil 1 Extended Performance, Recommended for Newer Corvettes?

Ask Your Stickiest Question. . . Or ask us something you’ve always wanted to know about using our products. We’ll sort through all the submissions and present the best questions to our automotive experts. The questions, and their answers, will post right here on the site.
Question:
Why is Mobil 1, and Not Mobil 1 Extended Performance, Recommended for Newer Corvettes?
I use Mobil 1 5W-30, the recommended oil for my car. Why is it NOT recommended that I can use Mobil 1 Extended Performance 5W-30 in my vehicle? I drive a 2006 Corvette Z06. Surely the same oil with a greater amount of cleaning agents would be superior.
-- Warren Stromberg, Leesburg, VA
Answer:
While your car is under the manufacturer’s warranty, follow its maintenance instructions, which includes using Mobil 1 5W-30. It is approved against the GM 4718M specification at the OEM recommended oil change interval. Either Mobil 1 5W-30 or Mobil 1 Extended Performance 5W-30 can be used in your vehicle once it is out of warranty and you will continue to experience  outstanding performance with either product.
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