All of the carbon that gets used can be turned into carbon dioxide, so there's actually no soot. Complete combustion of LPG takes place. Hence, it burns with a blue flame.
"Propane engines emit 12 percent less CO2 emissions, 20 percent less NOX emissions, and 60 percent less CO emissions than gasoline engines. They also produce 80 percent less smog-producing hydrocarbon emissions than diesel engines,” says the National Propane Gas Association. Easier to refuel.
These deposits are very abrasive and can contribute to engine breakdowns.
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Basic LPG