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Drip marks on the driveway (bad)

Rust in the exhaust pipe (good)

Cracks in the belts (bad)

Life left in the tires (good)

All lights are working

Color and smell of the exhaust:

- White and Sweet (coolant leak, very bad)

- Black (oil leak, bad)

Why is rust in the exhaust good?

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Complete combustion produces water, which eventually causes rust. Incomplete combustion will produce soot which will appear black.