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Discussion Starter #1
Coming back from an off-road race yesterday, my friend and I stopped to get fuel for our SuperDuty trucks and noticed puffs of black smoke coming from his exhaust as soon as we hit the highway. Anybody had this problem before? It was almost like smoke rings every 15 seconds or so.
 

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Shouldn't be anything to worry about. Does your friend have any performance upgrades? If he's stock he may need a fresh air filter or if his truck is high mileage they tend to smoke a little as the miles get up there. Black smoke is just unburnt fuel. I've never really payed attention to see if stk. trucks smoke any. If he were to floor it some smoke might be seen.
 
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