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