Because of the crappy fuel in my area, at WOT, it is capable of producing some black smoke. With 50 cetane fuel it doesn't smoke, if it does it's an extremely thin non-soot haze.

Also, those snakeoil cetane boosters do not stop my car from rolling coal. And this is considering the fact I dump an entire bottle of additive into an empty tank before filling up.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.