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Hmmm... I have only had a diesel for a bit, but have driven them extensively - both tractors and cars and I think I spot a flaw here. Black, Blue and White smoke in quantity is bad, but in cold (like 0 C and below) temperatures there is going to be SOME visible exhaust, when the hot exhaust gases meet the cold ambient air. If I am wrong here go ahead and correct me.
I live in a place were diesel engines are only for old trucks and old pick ups, and every single car that uses diesel engine has black smoke coming out of the exhaust, and when I want to buy a decent car that has a diesel engine I ask my friends and relatives about buying it nearly everyone expects its a shitty car.
also, I have read that diesel engines are more fuel efficient than petrol engines.
The only time smoke is visible from mine is under acceleration at night from the car behind headlights. How much smoke are we talking about here in this document?
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