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M
Subjective but I would personally use 0W20.
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Is it an older Corvette? Not getting up to temperature should be setting off P0126 codes.
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I 100% agree with this that the engine's operating temperature doesn't change between -20F in winter and +100F in summer. It just might...
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I'd stay the course with Valvoline Restore and Protect for 20k miles. If it doesn't help by then, nothing will. Switch to a thicker...
Like.
I'd stay the course with Valvoline Restore and Protect for 20k miles. If it doesn't help by then, nothing will. Switch to a thicker...