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The exhaust pipe interior is black like it's not burning clean. My Ford had 15000 miles on it and it doesn't have all that soot in it.
How long has your 2019 Chevrolet Express 3500 had this problem?
since new
Visitor
Sep 30, 2020
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Is this after both vehicles have been driven the same mileage in one trip? Short trip will not clean out exhaust - condensation plays a big role.
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