Review Article
A Review on the Impact of Bio-Additives on Tribological Behavior of Diesel Fuels
Table 1
Requirements for sulfur content in diesel fuels for on-road transportation [
29].
| Fuels | USA | Australia | Sulfur content | Year | Sulfur content | Year |
| Diesel fuel | 5,000 ppm | Until 1993 | 5,000 ppm | Before 2002 | Low-sulfur diesel fuel | ≤500 ppm | 1993 | ≤500 ppm | 2002 | Ultralow-sulfur diesel fuel | ≤15 ppm | 2006 | ≤50 ppm | 2006 | — | — | — | ≤10 ppm | 2009 |
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