I have two GM vehicles. 1) 2022 GMC Sierra Denali 4x4; 6.2 V8 and 2) 2022 Chevy Silverado High Country; 6.2 V8 as well. My Chevy is producing a mysterious black substance, whereas the Sierra does not. I am being told that this behavior is normal. I would expect the same behavior from both vehicles, but that is not the case.
2022 Chevrolet Silverado 1500 engine complaints
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