Chevrolet 4500 HD 2023 Manual page 363

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Breathing diesel engine exhaust exposes you to chemicals
known to the State of California to cause cancer and birth
defects or other reproductive harm. *Always start and operate
the engine in a well-ventilated area. *If in an enclosed area, vent
the exhaust to the outside. *Do not modify or tamper with the
exhaust system. *Do not idle the engine except as necessary.
For more information go to www.P65warnings.ca.gov/diesel.
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